Real question about Pokémon

Why doesn't the pokedex show you what egg group a pokemon belongs to?

In universe, the pokedex is supposed to be the difinitive taxonomy resource, isn't it? And yet it tells you almost nothing of ingame value about the pokemon you catch. Like, who cares how tall a pokemon are? Most of those figures are completely ridiculous anyway.

The only good thing it tells you is what areas you find the pokemon in. Weight, Height, footprint, mm are interesting to know, but it's just side fluff. It has zero impact on you when you play the game.

Wouldn't it be a great chance to make the strangely unexplained concepts of pokemon actually accessable in game? Then you could add ways to sort the pokedex by egg groups to find breedable pairs! Heck, why not show you the learnsets too!?

Plus, as someone who dabbles into evolutionary biology IRL, it would be so cool to get a vague sense of which pokemon are related to eachother.

And what if the pokedex entries had different tiers to them. Like at first, you know zero about them. Not even that they exist. Then you have tier 1 where you know how it looks like, it's cry and where to find it. And then tier 2 where you know everything about it (including learnset and egg group).

Why have this thing? So that it could be another cooperative element. Like you could share tier 1 entries to eachother so you can find a certain pokemon yourself and complete the entry. And the professor could reward you for completing both tiers. Essentially, one for seeing every pokemon, and one for catching every pokemon.

Just a thought.