Let's say Thor still has Mjolnir in Infinity War. What if he drops it on Thanos gauntlet hand..
He could most likely use the space stone to manipulate its gravity to get it off or maybe the reality/soul stone to change the enchantment or probably just break it with the power stone
He needs to make a fist to activate it. Can't do that with and unmovable Mjolnir on his gauntlet hand