Huh? Never use a platform from a watch seller? As opposed to what? Is there some open source, widely used, very compatible platform with other smartwatches out there that I’m unaware of? All the platforms are proprietary as far as I’m aware - Coros, Polar, Apple, Suunto, Garmin, Whoop, Oura, Android Wear etc. I went through a few (I mean, in our household we have Garmin, Apple, Fitbit, Polar and Oura) and I have friends who cover the rest, so I’m reasonably familiar with them.
How do you get the same data quality and analysis as good as Garmin? It’s probably got the widest ecosystem of devices and compatibility with gym equipment out there, which means huge flexibility depending on your needs, and since there’s no requirement for a monthly payment, Garmin is actually quite cost effective. It’s an excellent platform.