This is honestly something that I've thought about extensively. More recently more than ever, with the Festival Plaza. I mean come on, the mini games are hollow and pointless. The way you get stalls at Random!? Wtf... Secondly, also in Gen 7, the lack of PANTS for males. I DO NOT want to wear torn jean capris. I want normal length torn jeans like form X and Y. Also, the lack of additions that were considered core by many fans seem to skip around in the differnet Gens. I think the pokemon follow feature in Heart Gold and Soul Silver should have become a staple. The trainer contests, should have become a staple. Just so many tiny things that I'm left to scratch my head over. But more than anything is the lack of Endgame grinding areas is just unacceptable.
Yeah, now that I think about it, the Festival plaza SUCKS compared to the PSS or whatever. The bottom screen of friends and strangers online was great, but the festival plaza took those simple online features away and made it OH SO tedious. It's design clashes with the rest of the game, and it looks like something vomited out of a fairtale book.