There's a chance it could be repaired -- after all, Mjolnir has been broken and remade on multiple occasions -- but seeing Thor break Stormbreaker willingly is still a shocking sight. By destroying Stormbreaker, Thor not only reaffirms how powerful he is, but he also shows Bill how determined he is in his new quest.
It is safe to say that Stormbreaker cannot be destroyed by anything audiences have seen in the MCU so far. A power that Stormbreaker lacks is the "worthiness" enchantment of Odin. Anyone physically strong enough to lift and use Stormbreaker can use it.
Stormbreaker has the additional power to summon the Bifröst, allowing Thor to teleport anywhere in the Nine Realms. Screen Rant has identified Stormbreaker as the more powerful of the two, based on this ability, as well as it being a much larger and edged weapon.
Stormbreaker can be used by anyone, it isn't bound by Odin's enchantments to only be lifted by the worthy. Mjolnir is, however, still enchanted, meaning that only those that are worthy may wield it. This applies to your last two questions as well. If you can lift Mjolnir, you can wield it.
Thanos was only able to overpower Thor because he had the Power Stone and was flanked by his Black Order. Thor eventually helps build Stormbreaker and nearly kills Thanos, who has a complete Infinity Gauntlet on.
During a Vudu Viewing Party for Avengers: Infinity War, co-directors Anthony and Joe Russo revealed a key difference between Thor's hammer Mjolnir and his new ax Stormbreaker: the latter doesn't require worthiness. That's why Groot was able to lift the ax, not because he was worthy but because he didn't need to be.
Thor's hammer Mjolnir was defined by the fact that only the 'worthy' could lift it – so basically no-one except the god of thunder (and Vision, for some reason). But when it comes to the weapon's replacement, Stormbreaker – which Thor forges in Avengers: Infinity War – Groot is able to lift it too.
Thor. Thor, the god of Thunder, was undoubtedly the most powerful member of the original Avengers. His power continues to grow in the Marvel Cinematic Universe.
Another plus in the Thor column is Stormbreaker. It is a mighty weapon with no equal, that can be used to defeat even the most powerful of villains, including the Scarlet Witch. In Infinity War, Stormbreaker fully pierces through the power of six infinity stones (something that Wanda struggled to do herself).
The axe is so powerful that it was even able to quickly slice through and overpower the beam from all six Infinity Stones unleashed by Thanos, although he was caught off-guard and could have repelled the attack by other means.
Why didn t Thanos use the reality stone on Stormbreaker?
Apart from the scene in which he almost lost the Gauntlet and was stabbed by Stormbreaker in the chest, Thanos was confident he'd win. He didn't really need the Reality Stone in his battle with the Avengers. The other Stones were more than enough for him to get what he wanted.
Overall, though, Stormbreaker seems to have the edge over Mjolnir once again. Strong enough to open the Bifrost, reach Eternity, and manipulate storms the same way Mjolnir can, Stormbreaker's powers are greater than that of the mythical hammer.
So, while Stormbreaker grows roots in Thor: Love and Thunder, it is not another Groot being grown but an extension of a plant with the feelings of a teenager. Stormbreaker's jealousy comes from being born of a teenage Groot, and that's why it's so anthropomorphized in the film.
While Superman could potentially overpower Thor, blows rendered by the mystical Mjolnir would likely impose serious damage on the Kryptonian hero. However, with his super-speed, the Man of Steel could probably avoid the Thunder God's lightning.
If Marvel fans have ever wondered if Spider-Man was worthy of lifting Thor's hammer, the answer is yes. Just NOT the Spider-Man you think… Although he didn't really meet Thor beyond a couple shared scenes in Avenger's Endgame, Spider-Man has shown he's actually a big fan of the Thunder God.
Many viewers have pointed out that Thanos was able to lift Stormbreaker without a problem, but this is because the ax isn't enchanted as Mjolnir is. Others believe Thanos lifted Mjolnir (although briefly) and have even argued that he would be worthy of doing so.
Unlike the others, Zeus is not worthy to lift Mjolnir , but through a loophole, he can anyway. If Mjolnir is to enter his domain, Zeus's MCU powers should override Odin's enchantment, meaning he can hold Mjolnir.
It's unlikely that he could give her Mjolnir, considering that so few people in the MCU have been deemed worthy of its power. So if she can't use Mjolnir, the next best option that's already in his possession would be Stormbreaker. He knows it can be an asset in battle, which is exactly why he would trust it...
However, Stormbreaker also represents Thor's inner strength. He no longer needs a weapon to call upon his power; Stormbreaker simply amplifies it, a reliable partner for Thor. However, it lacks much of the history Thor has with Mjolnir. Stormbreaker represents a new page for Thor, a future to reach for.
Can Stormbreaker destroy Captain America's shield?
Stormbreaker is made of the same metal as Mjolnir, which was unable to damage the shield, but is more powerful and has the sharp edge that Mjolnir lacked. Thor himself is also more powerful than during those previous encounters. Yes. Uru metal can quite easily break vibranium.
He has feats such as defeating Surtur (who can destroy a planet), conquering the 9 realms, and sealing away Hela. While there isn't much doubt that Thanos could beat Odin if he had all 6 stones, Odin could probably defeat Thanos if he only had one or two of them.
Can Thor beat Thanos? In the MCU he certainly would have, if only he had aimed for the head. The Asgardian Son of Odin was extremely close to ending Thanos at the end of Avengers: Infinity War. After gaining the powerful weapon Stormbreaker, Thor becomes the wielder of the most powerful weapon in the universe.
