You never find out what abilities do by yourself unless you use Bulbapedia(either by looking up abilities or looking up base stats and doing a shit ton of maths), and being able to use Bulbapedia by yourself is hardly an amazing feat. We're not talking about stuff like telling people the way to every rare place, how to unlock Cinnabar Gym, how to get out of some random cave or anything that would give the player a feeling of accomplishment after finding it out without help, we're just talking about telling people the abilities like we already do with natures to save us some questions in Global and to save people time(if they were gonna google it).
EDIT: Also, I noticed that you said "whenever you need to check the natures,". We're on about abilities here, we can already put our mouse over natures to see what they do. And that brings me up to another point, why do it for nature but not for abilities?