I have an ARE V series (framed door), yes you loose a bit of visibility (darker due to the extra layer of tint, plus obstructed view where the pillars are) HOWEVER the rear view mirror is still absolutely functional and useable to see what is behind you. Not much different Rear view than an SUV.
I had a soft topper on my last truck and that obstructed the view much more substantially because a) the rear window is smaller b) no side windows c) the rear window fogged over after a couple years…the visibility was part of the reason I went with a fiberglass topper Vs another Softtopper.
It is worth noting, that due to aerodynamics, the rear glass gets convered in road mist when driving on wet roads/snow when driving in fresh pow, and there is no wiper to clean it (obviously), unlike most hatchbacks/SUVs
At some point, I may try to retrofit the digital rear view mirror and add a camera to the back of the topper