Regarding water resistance ratings, context is massively important. My first GPS fitness watch was IPX7. It did not fare well with sweat. Friends with IPX7 devices also had shore lifespans. My personal experience and my friends with IPX7-rated devices indicate that they do not last long if you sweat in them, especially if you are a heavy sweater. Garmin has since gone to 5 ATM for all of their activity and fitness devices. My hunch is they learned from their early IPX7 devices.
So, the current AW is rated at IPX7. Maybe it is better. But, if you sweat a lot and it is really IPX7, there is a good bet that its life will end in two to three years.
If you are going to sweat heavily and regularly in a device, I would want 5 ATM.
Sounds like the perfect time to upgrade the AW to the next iteration