Marvel’s Thor comics just had the God of Thunder explaining what it means to be worthy of lifting Mjolnir explaining why Captain America was able to wield the hammer against Thanos in the final battle of Avengers: Endgame.
Thor’s hammer confers his Godly powers on whosoever holds it, but that is trickier than it first appears.
The wielder of Mjolnir has to be worthy ; that is a condition which is never completely defined in comics, having initially set by Odin’s magic but later the hammer set his own standards.
Heroes like Beta Ray Bill and Jane Foster have proven you don’t have to be human or possess enhanced powers to qualify on the other hand; Thor lose his ability to lift the hammer after he became convinced that humanity doesn’t need its Gods, robbing him of his divine purpose.
But the famous wielder of the hammer other than Thor was Captain America aka Chris Evans who lifted the hammer in Avengers: Endgame.
In Thor # 15 written by Donny Cates and Michelle Bandini; the God of Thunder explains a key aspect of being worthy of Mjolnir which makes sense of Captain America wielding it in the MCU.
Thor explains Mjolnir is resisting his control because it is intended for warrior and he has become the King of Asgard.
He is still in the battle, but his focus has been shifted but it turns out that’s something Mjolnir requires.
Thor reveals that Mjolnir’s rejection is because he is “no longer the tip of Asgard’s spear”, and says it is for someone who is on “the front lines of any given threat to the worlds entangled in the roots and branches of the world tree.”
This revelation sheds some new light on what it takes to be worthy. Basically , the wielders need to be on the front lines of huge threats to the Ten Realms.
While Captain America shifted Mjolnir little by in the Age of Ultron, he was not yet the “tip of the spear” for this kind of conflict, while facing Thanos he did cross this line which made him completely worthy.
It seems that Mjolnir is not simply looking for a warrior, not matter how righteous but rather warrior in fray.
So it explains why MCU’s Steve Rogers rightfully fits the bill.