Originally Posted by njkayaker

Note that I didn’t say it wouldn’t be useful.

But your one example doesn’t do much to show that there are enough people to justify the effort (which is what my question was about).

The Varia sends info to the head unit or an app. And those generate the warning (or display stuff).

Do know about the Varia smartphone app?

https://www.garmin.com/en-US/p/716691

There are many more people with smartphones than smartwatches. So, the effort for the app might be much more worthwhile than supporting smartwatches.

The Apple Watch is (probably) much more popular than Garmin watches but it would weird to support those over Garmin devices and, again, it’s not clear if there are enough people who would find it useful. Supporting other smartwatches makes even less sense.