The phone or the OS? Hardware wise, my only gripe is the lack of wireless charging. I use an aftermarket plug to add it, but it doesn't put the charge pad quite in the right place, so I sometimes have to put it upside down. It also means the USB-C port is always occupied. That isn't a huge deal for me as I like to use plugs to keep dust out anyway
Software wise, I'm still running regular Android. I don't like that there's no Gallery app. You have to use Google Photos. That coupled with the fact that .nomedia files don't seem to work mean that the app shows ALL photos on your phone, including some you might want to keep private.
Other than that though, I'm pretty happy with it. Just upgraded mine to 15.
It's more than theory in my experience. I had a OnePlus 5 and lint completely ruined the USB-C port. I could spend 10 minutes trying to dig stuff out and get the cable right for it to establish a charge before I finally gave up and upgraded. It's why I'm not AS annoyed that the wireless charging add-on takes up the port. As long as it's also keeping debris out of the port (and the rest of the phone continues to run well) I'll live with it.