After Infinity War and watching Cap not able to do much against Thanos, I imagined maybe the next time around he'd be more prepared. Maybe Tony would've gave him a suit of armor to give him a better fighting chance. And maybe he would've wielded Mjolnir, as we always wanted to see.
Well we got that Mjolnir scene, and it really didn't disappoint! But still I wondered what it would've been like if Cap had been more armored up. Well maybe in an alternate reality we could see something like this!