It feels fairly realistic and reasonable, if they do all live in Stark Tower and have developed friendships. Suppose Tony needed some help redecorating and had a bunch of heavy furniture to move around? He simply asks his friends Steve and Thor to do a bunch of heavy lifting in return for pizza and beer. Perhaps Pepper has a flat and is missing a jack to swap out the tire; not much of a problem for our dear gamma-powered friend to lift up the end of the car for someone to change the tire without even needing to kneel down. I like the alternate universe you imagine. It is similar in some ways how I like to imagine other super-powered teams act and get along with one another once the costume comes off and everyone needs to unwind a little. Thanks for sharing and I hope dear hulk gets to enjoy some pie soon.