It seems like we are just talking to ourselves in this forum, but I'll throw in a thought.
I certainly agree and empathize with those who desire bugles for straight volume. I am not an old school guy....I aged out in '98 with a bugle, but taught div III, II and World Class…the latter using Bb. You simply can spend less time working on tone quality and intonation with Bb's. You get a better product, faster. Ultimately, it's about the kids, but no one would come if the product was not good or did not improve. If you like the sound of G lines, more power to you. My mama always said, there is no accounting for taste. Soon though, all those Jr. Corps kids are going to come up the ranks to Sr. Corps and say, WTF is with this out of tune, dinosaur G thing? G horns were such an important part of our identity and history, but I don't see (or really want to) how they are going to survive. Not to put too fine a point on it, but anymore, G's are like an axe where a scalpel is needed.
Playing in tune with yourself (use a tuner), and your part of the chord, makes you sound louder. Is this in question?