I'm also not liking the new swiping navigation from Android Q. My case is a bit tall on the sides so it sucks to swipe "back". But that is not my main issue, if I have my keyboard up it thinks I am writing y swiping, if I have WhatsApp open it usually thinks I am swiping to reply to a message, if I have Google photos it thinks I am swiping to the next/previos photo. The solution is "swipe and hold", so now every "back" take long negra than it ever did or that it was meant to take. Add to that when you open a page on Chrome and accidentally hit those annoying ads and need to hit back a few times to go back and you spent 5 seconds when you used to spend less than one. Or if I am on YouTube in landscape and want to scroll from the beginning of the video it thinks I want to alt+tab to another app... lots of inconsistency.
One good thing is that moving from open apps is a lot better, sliding back and forth is great, in the last Android it wasn't as intuitive. I believe they expect us to use this a lot more than the swipe up and hold that takes more time. Anyway, I keep swiping up and going to the home screen all the time, need to get used to it.
Another small complaint, the small thin bar on the bottom looks ugly as hell. If I am on Era the entire screen is black (dark theme), the top is purple (the color the system defaults for the Chrome skin) and the bar is white. The bar should be transparent or match the color of something on the screen.
I believe apps will be updated to support gestures decently in the future, but for now it is a shitshow, there are 3 different ways of using the back functionality and there is no way apps will prioritize the one method that the least people use.