Y'know what would make these games absolutely amazing, but there's no way would ever actually happen, ever, in a billion years? If they gave you access to and let you use all the Mega Stones from the very start of the game.
Because y'know what would happen then? Y'know what you could do? Catch a Weedle in Viridian Forest, evolve it into Beedrill real quick, and then use Mega Beedrill strats for the game.
And yeah, I know even Mega Beedrill ain't exactly the best matchup for Brock (assuming that much hasn't changed and we still fight him as the first gym leader). I'd do it anyway, because Mega Beedrill! Mega Beedrill! Would be worth it just for the hell of it/to mix it up/for the memes.
But instead, it's an open question whether Mega Evolution will even be in this game. And even if it is, no way it won't be until later at the game at best. And this makes me sad, thinking about what could be instead. Alas... :(
EDIT: And to be clear, in case this isn't obvious and before anyone takes me the wrong way, I'm mostly being silly here. But it definitely would be cool to use stuff like Mega Beedrill/Mega Pidgeot and the like from relatively early on, right, if only we were able to? I'm not alone in that, right? Please tell me I'm not the only person that would get a kick out of that.