left handed setup

I feel like in drum corps, high brass players don’t really have opinions on what brand horn they’re on as long as they sound okay.
Like, low brass players have so many grievances it’s unreal. Like my ideal tuba would have the right hand setup of king, the left hand setup of yamaha, the tone production of Jupiter and the balance of adams. Why are Euphs so bell heavy??? Why is the intonation on the king 1151 so shitty? Why don’t more contras have 4 valves aside from the issue of weight? Why don’t all low brass instruments have the first valve trigger like jupiter? Why does everyone but king use an over the hand lead pipe when the underhand one is not only more comfortable but allows for players to keep a bigger, more open valve hand? Like jfc