This has largely been my experience as well. I was blown away by Beta 1. Part of it is getting used to the speed improvements (I used my wife’s phone last night, same 7 plus as I have), which is on iOS 11. Felt horribly slow. But my connection, particularly to WiFi has been progressively getting worse, had a bug when taking a screenshot that plagued me through the iOS 11 beta where the Done button was on top of the carrier symbol and damn near impossible to tap pop back up on betas 4/5, it’s been an odd run. Going to give this a whirl. But good news is there’s still at least one more beta and then GM in time for a Sept iPhone event.