Yeah that's something I know now
It's still not a panacea for that room, for the barrel dudes further away you still have to bounce them well.
I think the recent episodes overall showed well how utterly pointless the various ammo systems in the game are. You only really run out if you have to repeat an annoying challenge a few times, so it just adds tedium there. After a few fairies, your maximum amounts of the incidental stuff are so high that you'll never run out from said maximum, so any arguments for, dunno, limiting the time Diddy can fly around exploring are moot. Crystals are the most likely to annoyingly run out, the rest apart from ammo you'll probably never see empty in a meaningful way. Oranges are too situational. Music charge? Gimme a break. I almost forgot about film rolls, lol.
Only ammo you could make an argument for, but honestly, the guns aren't good enough to keep using on everything. I know that it's fastest for some enemies to spam them down with guns (because I watched a speedrun), but that takes, like, 10 shots. Whatever. The vast majority of time you're using ammo as a key, to unlock doors or bananas in balloons, there's no reason to have it limited there.
Of course, if you get rid of all the barely useful pickups, the worlds will have many, many empty corners, but that's its own problem, isn't it?