My 2011 iPad bought in 2012 finally had its very first OS glitch at Thursday's gig after 7 years of being slept and woken (not powered down) at least 95% of the time. I'm no computer guru, but that seems stable to me. Same goes for Axe-Fx II, except it's never had a glitch outside the damn display ribbon cable jacking up screen visibility.
Unless I'm mistaken, my ancient iPad3 is a Steve Jobs product or a mostly-Jobsian product. Apple under Cook is a different company. They don't have a compelling pitchman & anal-retentive obsessive visionary. Jobs wouldn't stand for many of the recent and current decisions around design and usability. That said, Jobs had several failures under his watch. But at least he got better. Cook seems to be losing ground. Cook is proof you can't design by spreadsheet. It takes vision, passion, art and incredible engineering.