I then looked at what http requests their app makes which was more straightforward and actually interesting but still not what I wanted... I hope I will find the time to try again soon.
I would like more transparency on how long each device gets updates for, similar to how Apple handles their products.
https://play.google.com/store/apps/details?id=com.azya.fitbi...
Casio has smaller G-Shock smartwatches (not just the giant circular ones) that track your activity, heartrate, etc. But if you want smartphone notifications, then yeah, sadly you are out of luck.
I am totally with you overall, though. I feel that if someone were to nail it, it would be Casio.
So when friend send a simple "thumbs up", it displays the Unicode replacement character.
How does the Casio do it?
Were you referring to that icon in the top left corner of the display that looks like it could be a notification counter? If yes, then that’s a fair point, but just being able to see the number of notifications is not the same as being able to see notifications (especially since it doesn’t seem like it would even tell you which app the notification is from, let alone what it was).
I would love to be corrected in case I am wrong, because it could be entirely possible that I am not even looking at the correct watch.
0. https://www.casio.com/us/watches/gshock/product.GBD-200-1/
I haven't made one myself because last I checked it was a hassle to ship, but this might be what you're looking for, F91-W exterior with minimally smart replacement innards.
The biggest downside is that the battery does not seem to be user-replaceable, so the 1 month of run-time I used to get slowly fades down to about a week or two after a couple of years of use. I can't go away for more than a week now without bringing the charger.
However, it is a very minor thing when the battery lasts as long as it does. If it holds 80% capacity like most other batteries today at 300, or more, cycles it would take over 10 years for the battery to degrade significantly considering each cycle is up to 30 days.