Don't know if you're aware, but X/Y and the Alola games do have an intro, it just plays after the title screen as opposed to before it. If you are at the title screen and wait for a while (not sure exactly how long, probably not more than a minute), the intro will start playing. I remember that it took me a very long time before I learned about this when I played X/Y, probably more than a year after the games were released.This was a topic I brought up in Discord. Its not something that annoys me per se, but I do find it rather strange. Something I noticed- The 3DS games and onwards lacks an intro. They immediately go straight to the title screen. The only exception is ORAS, which was a remake. BW2 were the last games with a cinematic intro before the game's title screen. I find it kind of disappointing, because these cinematic intros were a real pleasure to watch, and I enjoy them to this day. I can't see why they'd stop doing them in the 3DS games onwards.
I am personally not super bothered by this either. While game intros can be fun to watch, I skip them and go directly to the title screen most of the time when I play, so the way they handled them in X/Y and the Alola games did not bother me that much.