Hi , i was happy with that function on my F7 pro, so far i still using it in my F8.
The issue with F7 pro was its take couple of sec (5 to 8 sec for me) to detect you stop, so your final lap time is impacted. but i was fine with that at the end
On F8 , seems they improve the detection time to be I guess around 3 sec or less, but maybe too fast now!!!
as almost each time I turn, the auto pause is activated even if I'm swimming, so each turn I'm losing 3 to 5 seconds that impact a lot my final lap time.
I got better results to move first out of water, after turn, the arm I'm wearing my watch, but this is still troublesome ....