One other reason we feel they hit harder because they do hit harder.
We are chronoing with 0.20 but with heavy BBs HPA can do ridiculous joule creep and HPA users use 0.28+. Same with gas guns.
If you would chrono with 0.28 you would still get around 349 fps and that's about 410 with 0.20. Yes, a 40 rps short burst of 410 fps does hurt more.
Yes, there are sane HPA/gas users too, but until the sites chrono for energy with the BB used there will be players who see the current chrono rules as opportunity to f*ck the system.
Personally I don't care about them on the field. As soon as I hear someone using a sewing machine, I just avoid frontal assault. Not that I do that anyway. But I see that as unfair advantage against the newer players, especially rentals. It is a bad message to them.