• last year
If you pay attention, Thor tells Captain America to change his hammer in the final battle of End Game.

It's not because Stormbreaker is bigger than Mjolnir.

He has a reason for not allowing Cap to use Stormbreaker.

When Thor tells the Guardians of the Galaxy that he is going to Nidavellir and make a weapon that can defeat Thanos in Avengers: Infinity War

This means they will not be able to use it because of the effects it would have on their bodies.

Thor wanted to prevent Captain America from suffering the effects that Stormbreaker leaves on its users.

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