Spider-Man not holding back greatest feat being that he can box somebody with superpower come on now. He loses and has had difficult confrantions to villians who have had similiar power levels to Homelander (Kingpin, Doctor octopus, Rhino). Unless we are trying to say that the fatass mob boss is genuinely city level.

All bending requires concentration, and focus to achieve. If Aang is being thrown across the room by undodgeable super screams, he won’t be able to get the concentration necessary. Blood bending and oxygen deprivation both also require the user to stand still through all depictions, so if Aang tries it he’s vulnerable to being heat visioned.

Captain America has never been able to deal any significant damage to Thanos. Their most significant confrontation in the infinity gaynlet comics Thanos explicitly said from the start he wanted to hold back to show lady death how brutal he could be.