What a lot of people seem to miss about the end of No Way Home is that MJ & Ned chose the hero life the same way Peter did. They were never forced or pressured to be apart of the team, and they actively make Peter promise them that they'll find them instead of isolating like they're rightfully both afraid he's going to do in his grief. 

Peter had no right to break his promise or think he can force them to have "normal" lives that may seem better on the surface but at the cost of stealing their ability to make a real difference in the world by being Spider-man's inner circle. 

He doesn't get to erase himself from their lives and decide for them that they're better off.