First off, to say that a shorter barrel affects accuracy is downright false.
Lee michael
501

Doesn’t decreased velocity lead to increased drift over distance? Not an issue at all for close quarters, of course, but some people like ARs for longer range shooting as well. Seems like you could run into some issues with increased drift with the shorter barrels in those situations. It could be compensated for, but you’d still be having to compensate for something you otherwise wouldn’t, no?