Re: Chromebook is particularly good at fulfilling its promise of looking after itself.
Having recently set up well over a thousand C'books (maybe several thousands. I lost track) as my part of a 34,000 deployment, I can tell you they do indeed degrade and must be completely refreshed and reset after about a year.
The reset process isn't that hard, but having access to an enterprise level server helps a lot. We had several. Among those resets there were several complete failures. Say one out of every 50-ish. Some of that was due to hardware breakage like screens and trackpads, user abuse and internal drive failure. But mostly, obsolete hardware.
As I believe a sample of several thousands counts as accurate data these days, and trading notes with the rest of team and seeing similar experiences, then there it is. 34,000 C'books worth of data.
My experience is that C'books do NOT have long term durability. Roughly, 3 years, tops, but needing refresh resets at least once a year.
(BTW, the photo looks EXACTLY like my previous workspace.)