I agree quite fully with this. The person with a CCW and an AIWB rig, or a pistol with a RDS, WML, or laser can find a welcome home in USPSA. Now, the RDS, laser, or WML may land that shooter in OPEN, and they will definitely be at a disadvantage, but they can still receive a score. I think that is significant. Honestly, I also feel that a CCW holder could easily use OPEN as a test bed to see what works better for them from a purely technical skill related standpoint, as they could play around a lot with their carry gear and see how it affected their match results. Maybe try with a slide mounted optic for a while, try using a laser for a while, all kinds of stuff. Heck, they could probably use them in conjunction and see what worked best for which shooting situations. And again, they can do all of this and receive a score.
I do realize that only a tiny fraction of CCW holders use this kind of gear, and that the IDPA equipment restrictions are a bit closer to what most CCW holders use (at least the ones that don't just go for a j-frame in a pocket holster route, which is probably the largest percentage).
ETA: At one club match I shot, there were two shooters on a local (to that area) SWAT team. They ran their duty guns with lasers and WML's the whole match. Now, they didn't win OPEN, there was a legit M-class Open dude there that took care of that, but they were both very good shooters to watch, and they sure as heck weren't last in the division.