Gamefreak throws away good ideas they already had implemented at some point, and often just don't see good things they could do in their games with very little effort.

Let's list some quality of life improvements that would require them to do little to make the games much more enjoyable.

>Equal IVs in ranked matches with no training required, same as levels are equal now
>Party visible on lower screen at all times
>Able to inspect stats and nature right after hatching and egg
>Able to see numerical values of EVs and IVs
>Evolutions, egg hatching, etc with animations that are possible to skip
>Faster transitions between menus
>Skippable Fly animation
>Full battle history available online on your Global Link profile
>Able to inspect and trade pokemon on the Global Link website