Thou shalt not crrr...crrr...criticize the prooo...fess...shun...ulls. Although the professional moniker doesn't give you any indication of ability, but rather that someone is performing said task for compensated vocational purposes. Hence this example of a professional:
Burris is making a 1x, 3x, and 5x Prismatic sight that is illuminated and etched for your convenience.
Burris 3x
I'm going to go with the fact that since most people don't hunt with an AR platform, the rail real estate just isn't there. For me I'm thinking long and hard about blocking the top of my rifle's action and how quickly I can get access to it for loading more long magnum shells in the case where I have depleted the magazine. I'm currently using a two piece scope base and even considering rebating the scope mount to clear the entire action when the scope is removed. Eotechs are long, take up a bit of room, and the world looks at them and ITAR when they get on an airplane. They are not innocuous.