I think the stock labels are indeed cheating. They are way too obvious, give too much info, and are impossible to miss. *Modded* minimalistic labels however, I disagree are cheating. They can be just a few pixels wide, all the same color (black for example) and only at specific ranges. In my view, the lack of visual accuity on a PC setup is roughly compensated by this addition. I've spent a lot of time in the air, and I assure you that the human eye is 1000x better in real life than the portrayal on a PC screen.
Consider that the A-10's primary mission was visual ID of targets. in the A-10A days, it was expected that the pilot would aquire most if not all of their targets visually (with binoculars). If you take away your TGP, do you feel you could still fight the aircraft succesfully in this sim, in a dynamic non JTAC scenario? I doubt I could.
So try nerfing the labels down and see for yourself. I use them when needed, and don't feel very bad about it.