I've always found it odd that while the inspiration for the ranger class was clearly Aragorn, the iconic D&D ranger has of course for many many years now been Drizzt. And while it's been a long time and there's many of the later books I haven't read, to the very best of my knowledge Drizzt was never written as casting spells other than those that came inherently to him as a drow. The quintessential D&D ranger doesn't even cast ranger spells.
I'm with @Charlaquin on this one.
There's no storm giants, liches, and mindflayers on Middle Earth.
The one dragon got luckyshotted in a DM created weakspot and they needed a caster to defeat the one fiend.
If the Dunedain were in the Forgetton Realms,they'd be shooting lightning and fire arrows and summoning spirit bears.
The DNDNext playtest. The bar was higher then.This is it for me. Why do so many things in D&D have to be a spell?
The rogues sneak attack isn't a spell, so why is hunter's mark?
Anything "mundane" that couldn't be explained or describe in less than a few sentences without restriction didn't pass the test or became a spell with "It's magic" as an excuse.
You might be okay with rangers talking to animals directly and getting verbal responses back but enough of the fanbase would not accept that without magic to force it to remain spell only.