Don't confuse the water rating (how deep you can take the watch) with what pressures you can read with the watch. If I recall, some devices max out pressure readings at a depth that would work for swimming - it's so non-diving watches aren't used to record diving. If you want an Instinct for diving, there is the Descent G1: https://forums.garmin.com/developer/connect-iq/b/news-announcements/posts/garmin-introduces-the-descent-g1-series
No way...
You sir just made my Day.
Didn't know this existed.
Price is okayisch but still on the Very Expensive side...
The Max Rating is an Important Point you made here, I found https://www.apnea.me/
but their FAQ Mentions the Problem you described.
Thank you, Sir.