Basically I mean that WearOS is a system dedicated for that small devices, unlike full Android. And because of that, there are several obstacles, like the interface isnt’ optimized, batteries need to be large and that makes FAWs bulky. Besides, no NFC support, unreliable sensors, etc.
Of course, like I said, I see huge advantages also. Mainly you can install almost any Android app. So in the end, it’s always the matter of personal preferences. If someone does not care much about those limitations, it can be a great solution. In my case though, I couldn’t live with them on a long term 