I would summarize that as: the Ranger class is someone who "wields" the terrain (rather than someone who "adapts" to the terrain).
This concept has high tier potential, including summoning high tier creatures in the terrain, inflicting high tier damage and conditions, and similarly mobility/barrier (including teleportation) and detection/stealth within the terrain.
If you want to go the adaptation route you need to have a terrain system that is just as deeply varied and remixable as monsters, and that in turn means your fiction is going to edge towards the more overtly magical, because even with soft mundaneity, theres only so much you can actually do with real environments without creating a gonzo world. So, you'll end up setting those gonzo worlds as separate planes and dimensions or whatever.
And what do you know, now you're circling back to the same thing 5e already does that makes Rangers as they exist make sense all the way into the epic tiers by expecting such high level characters to be Multiversal heroes. Makes a hell of a lot more sense to be as good at survival and travel as the OG Ranger was when the places you face fundamentally aren't inhabitable by conventional life, so it takes a great deal of skilled ability to survive there, the kind of skilled ability that makes mundane Bubblegum forests a tonal mismatch to what the party should even be concerned about.
Ive said it before, Ranger as a concept only breaks down if you expect the exact same wilderness to be an appropriate challenge at level 1 and level 20, and unless you're going to embrace the video game method of level scaling, that just isn't going to happen.