The HUD is too cluttered so I'm always tempted to play with the HUD off but then I run into identification issues. There's no in-between. How difficult would it be for the devs to implement a feature where you can just hide teammate markers after a custom distance or even reduce the overall opacity of the HUD elements?

There are options to turn off certain HUD elements in the settings, but they're all the wrong ones. I don't want to turn off the objective, sub-objective, ammo, terminal (funny thing is they actually break it down by terminal type, they went through time, resources, and money to do that, but they don't bother to add toggles for other much less important elements) markers. Those are absolutely necessary. I do want to turn off far away teammate and squad indicators when they clutter up my entire screen for no good reason and they're on another side of the region.