i think camping is acceptable to the point where you dont make a huge bunker/skybase and stay there all game, unreachable unless someone has a pearl or tracker to get to you. tnt trapping is not only hilarious (seriously,i freaking love it x3) but also an important tactic for people who arent as skilled in pvp. doing this in team skywars could be more risky as people might see it as team trapping, even if it wasnt intended to.
tnt trapping should be allowed, or else you might as well remove the kit, which would make me very sad :c