As a real world example my ipad pro on the latest iPadOS 17 can't even maintain 2 weeks of uptime without crashing or getting so slow it becomes unusable without a restart. And I've tested it multiple times on normal workloads using just the stock apps without ever connecting it to external devices

I wasn't expecting 20 years of uptime like an AS/400 but 2 weeks is absurdly short reliability for under the most ideal circumstances.