The point, as its not being made clear enough, is that you fundamentally limit where you can go when you insist on basing whats mundane or not on the real world.
One of my personal ideas for a Ranger capability is sending messages on the wind. Sure, that's an impossible magic thing in the real world.
But it doesn't have to be that. You can position it as just a normal thing. Of course you can do it. Thats how this world works. Not everyone can do it, you have to learn.
The fundamental problem with doing something like the Ranger, but really any of these Martial type concepts, justice is that these are high fantasy worlds.
We do not have to make everything magic or supernatural. Being unwilling to treat these things as just being mundane parts of that world is just terribly unimaginative. And that pays awful dividends when it comes out of the game.
How many times have people complained about 5e and how everything that isn't lame and weak is just magic? How boring is that? How dull?
Its not like this is just arbitrary, either. There is a line, and we're not talking about saying punching rivers and cleaving mountains being "mundane" or "uncanny" things.
But something like tracking by your ear to the ground? Sending a message on the wind? Chucking a pebble into the woods, and provoking a nearby dragon to stampede into your enemies?
All extraordinarily thematic things that do not need to be magic nor supernatural to justify their existence.
I make it a point here because closing off your imagination like that means you're not going to be able to conceive of something better.
You can justify the Ranger more when you can let go of that, and the weak take 5e uses, to broaden what the class can be and can do.