Mobile phones are so locked down from regular users that they usually just physically break before the operating system becomes unusably slow.

Laptops can be destroyed by software. Give a regular user permission to install programs, and suddenly there are a random purple monkey sitting on the desktop telling jokes and multiple crypto miners.

Oh no, I haven’t thought of BonziBuddy in a long time!
Anecdotal, but I’ve never had a phone break on me. Every phone I’ve replaced still technically worked, but was just older. I wouldn’t be surprised if the majority of people are the same.
In my experience it’s the opposite. It starts behaving unreasonably slow way before it physically breaks, unless I do something very stupid, and there is no way to free it from creeping bloat or even diagnose what’s actually wrong. Old laptop will behave like new again when I get it clean and install fresh OS on it. With phone there is nothing can be done, I have like 5 perfectly working old phones that just became too slow at performing the same tasks
Not really destroyed though. Do a fresh install, or rollback to a previous OS image, and everything is back to normal.