i took your advice and downloaded the beta today. I have not experienced any unresponsiveness, whereas i was getting them frequently everything on ios 12. Hoping this is permanent.
Good luck! I want to believe! But I'm not a believer anymore.
Unfortunately I've seen many times here and on iFixit how there were reports from several people who updated to various betas (12.0, 12.1, 12.2 etc) that seem to have fixed the problem for them. Some of them were definitely paid Apple employees. But then after the final release there was a big wave of folks who updated but the update didn't change anything. The responsiveness and all the touch problems came back after a while. That's a hardware problem after all.