Yaarel
🇮🇱 🇺🇦 He-Mage
Human-only makes the core rules practicably setting-neutral.I just don't understand why you would make the PHB human only.
Different players want different species. Different Settings feature different species. Setting-neutral core rules makes diverse preference easier.It seems like players want options like dwarves, elves, etc.
For example, many old-schoolers want 1e Elf, Dwarf, Halfling, and
Many new schoolers want Elf, Dragonborn, and Tiefling.
Meanwhile Aardling and Goliath are on the way. Maybe Genasi and ten other species too.
Gnomes are important to many groups who have one player who loves them.
Magic The Gathering settings often have a completely different selection of Nonhuman species.
DM homebrewers do whatever they please.
The core rules need to get out of the way of all of these possible Setting preferences.
The purpose of moving the Setting species into the FR Guide, is for players who want a different Setting, such as an Eberron Guide with its own versions of Nonhuman species. The Human-only Players Handbook will work seemlessly with any Setting that the DM prefers.And especially if you move that material to the FR book, people would get resentful because a lot of people have no interest in FR and don't plan on buying the FR book (not a knock on the setting but I would imagine a sizable portion of the hobby doesn't buy forgotten realms books).
The rest of my post listed several ways to get the Nonhuman species options for free.D&D is already asking a lot from consumers with three core books (even when I started I had to slowly buy the three core books over like a year or two).