Except there is a huge distinction from the species you complain about.
Orcs and Gnolls are vastly different outside of their evil nature, much less when compared to devils vs demons.
>but that in itself is the problem- It requires people to read and investigate a little
>Complaining about reading
>Tabletop gaming
Do you even remember where you are? You're basically complaining that you don't understand the difference and want to force everyone else to dumb down their differences.
> From a new player perspective, it's a weird and confusing distinction
From a new player's perspective it's much more confusing to distinguished those more similar with a more subtle difference
>Gnomes and halflings
Gnomes are the tinkering illusionist type. Halflings are thieves.
>Devils and demons
I'll give you that. The difference is blurred, but only in your head due to the alignment system, and it still is pretty simple to understand.
Devils are the equivalent of the Stalin's rule, the Yugoloths as the spawn of Mr Krabs and all of the Jews, and Demons are the equivalent of the Mongol Horde if nobody was really in charge. Simple.
Devils want structure and power in their favor by manipulation of code and backstabbing others while using their ever growing perfected system. Demons just want to be lawless bad boys at the cost of anyone else's system of order and will actively fight a system just people it pisses them off or makes them feel controlled. And Yugoloths? They just want what ever will make them profit for what ever need whether not they have to follow a system, break rules, or stay out of it all together.
>made subcategories of the same thing.
They already are. They are evil outsiders, specifically, Fiends. Demons, Devils, and Yugoloths. Manifestations of evil made real. To label them under anything else would be self defeating.