XY is a poorly paced game, but some of these things aren't really issues.
>>52435272>why the fuck is AZ so massive?Pretty sure it's just to reinforce that he's centuries old.
>if so how did it manage to not destroy itself?This is actually explained. It's said that Xerneas (the life-giver) restored the region's plantlife, trees, and landscape post-war.
>Lysandre planned on using the weapon to kill all life except for team flare so he can create a beautiful new world with no war, yet his entire team is made up of corrupt scientists and admins in it for the money?The rich, egotist supervillain is also a hypocrite, yes. He talks about beauty, but thinks you have value if you come from money.
>no explanation for where Mega rings come from, who makes them, or why they're importantThe stones are basically a result of nuclear fallout from AZ's weapon. In ORAS they're said to be meteor fragments. The rings are little more than an accessory. Again all of this is explained.
>every new area either interrupts you with a holo clipYes. This is an important detail; Team Flare was using the holo caster to spy on the public. And Malva also uses it to sell Lysandre's products. They ran the local media behind the scenes.
>exactly 0 explanation as to why they didn't just press the button as soon as they couldLysandre tells you directly that he wanted to give you a chance to stop him because he saw your potential as a "chosen one". First chosen by his old friend Sycamore, then chosen by that Lucario to wield Mega Evolution (re:he was monitoring your progress in the background).
>>52436646>DUDE ALIENSI don't why anyone latches on to this, especially after USUM. It makes less sense than the story we got.