>23 gen 1 pokemon with gender differences
>22 gen 2 pokemon with gender differences
>18 gen 3 pokemon with gender differences
>31 gen 4 pokemon with gender differences (including some new evolutions of species that have differences)

>only THREE gen 5 pokemon with gender differences (Unfezant and the Frillish line)
>only TWO gen 6 pokemon with gender differences (Pyroar and Meowstic)
>NO gen 7 pokemon with gender differences. Alolan Rattata and Alolan Raichu have no gender differences despite their Kanto counterparts having them
>NO mega pokemon have gender differences even if their regular forms do (eg Alakazam, Garchomp, Camerupt, Abomasnow)

What happened? I love the small details that add variety to pokemon, like Spinda's spots and these differences, but they basically stopped existing after Gen 4, with only the most obvious ones appearing after that. Did the change to 3D models make them lazy?