I guess there are some tradeoffs, for sure. I've encountered a couple things:
- Bad location functionality. The phone is most likely to blame for this, but I can't say with certainty. GOS uses a custom proxy server for location related operations, so maybe that's the reason, or maybe I fiddled too much with settings and messed something up.
- Very ocasional crashes due to exploit protection. This almost never happens, but can be annoying. Some app may have a bug that would be overlooked by another OS or try to access some feature that is considered exploitable and the system will kill it, letting you know why with a notification. You can fine-tune these protections at the system or app level to make it work for you though (at your own risk).
- If "tap to pay" refers to NFC payments through some app like Google Pay, I think they do work. You just have to enable NFC (you can even enable it only if the device is unlocked, which is cool), and configure contactless payments with your payment app. I don't use this feature though, so I'm not speaking from personal experience.
I think that's it, really. I found the actual user experience to be quite breezy.
Tanks for your clarification!