it demonstrates a pattern of failure to adequately test and verify their software…
Bugs are inevitable. I'm not surprised that there are bugs in the first half year for brand new software like this. I have to say, I'm still kind of amazed that Apple was willing to add dive computer functions to an Apple Watch at all.
I expected to see more bugs, honestly. Googling around a bit, I haven't seen any bugs that look like a serious safety issue, and almost none for in-water functionality generally. Still, it's easy to see why Apple would conservatively limit functionality to "recreational"/130' depths.
Apple doesn't release unit sales figures, but Apple Watch Ultra sales must already be in the millions. The AWU is probably already the best selling dive computer in the world, depending on how you count Oceanic subscriptions, I guess. Apple has a big target on their back for any kind of serious problem. So far, they've avoided them, and the software should continue to improve.