>>55672790>landholdingIt arguably started before then and was arguably the worst there
>dexcutUSUM was the last game that qualified in a very technical sense, although if you want to count the USUM exclusive Pokemon then SM would be the last one that counts. Either way, not XY.
>no postgameLiterally every game since XY has had more postgame than it, although the Switch titles rely heavily on DLC
>gimmicksMega was the first gimmick, given the way every other gimmick functions very similarly to it
>artstyle changeReally vague and unhelpful descriptor, Gen 6 argubably had a "different artstyle" with the awful chibi models on the overworld, and there's an argument that SS changed the art style as well given the change in art director.
>>55672966Technically true, it also doesn't help that in a lot of ways Gen 5 is functionally similar to Gen 4 on almost every mechanical metric. Gen 1 and 2 and Gen 3 and 4 have a lot more mechanical difference between them. Even if Gen 5 is tonally and somewhat aesthetically off compared to the previous games it fits in other ways. I'd personally put it at the end of an era but it really could go either way.