1) You're spending a lot of time leveling up in non-wilderness areas.
2) You're spending a lot of time sitting in civilized areas.
3) You're hunting people consistently on roads etc.

Maintaining a 75% wilds time isn't that hard, even with the additional condition that you're not Outlander.

With a Tribunal it might be a struggle, or need to carefully watch the timer. That's about it.

Also, there is an option for non-conventional ranger cabals like explorer, which, in essence, does precisely what everyone is asking for here.

One reason why I (personally) tend to be against these types of suggestions, other than the code work necessary which diverts resources away from other projects, is that this is a hard-wired class dynamic which, to some extent, enforces a style of RP on someone. Breaking down that dynamic might seem like an irritation for a lot of players, but would remove an incentive to play the class a specific way. Experience has shown, that in many cases, removing such incentives tend to diminish the flavor of how the class is played.

(Take, for instance, recent discussions on Villager Apps using healers, or issues I have personally seen where paladins skirt their code. Removing this barrier, in my opinion would be a sizeable leap towards converting the ranger class from a wilderness based ranger into a warrior with a handful of wilderness skills.)