Does Mjolnir actually grant Thor's powers to the worthy wielder like Odin said? It seems like there was more to wielding Mjolnir than simply wielding it. It seemed to buff Cap's stats and give him magical control.
In Endgame, not only does Cap have the ability to summon and spin Mjolnir, but channel lightning. He can hit hard enough with it to hurt Thanos and knock him back. It also seemed like his shield strikes became stronger. IIRC, Cap breaks Thanos' helmet. Cap doesn't just lift the hammer but seems stronger when wielding it. Then there's lightning control when last I checked, there's no button on Mjolnir. So it's magically linked up to Cap's mind and the connection holds even from a distance so he can summon it and the connection seems to extend to Stormbreaker. However, Cap can still get hurt more easily than Thor when disarmed of Mjolnir it seems, and he still ages normally without it. So is it that Cap gains the power of Thor only when holding the hammer and tapping into its magic? Or did it give him a passive buff that only applies to attack power? How and to what extent was Mjolnir boosting Cap? How does it work?