Re: "I got myself a Mac and could still use my scanner"
"Anyway drivers are up to the HW maker, you can't really expect an OS deliver drivers for each and every device ever produced. Especially complex ones like scanners or printers which may have very specific functions."
What you can do is ensure that the driver interface is stable. If a new driver interface has to be provided then ensure that some means is available - a shim or the old module - to enable the old one to be used even if it's not the standard.
The functions of an update shouldn't include breaking things that are working legitimately.
Unfortunately this has become forgotten in the IT industry to the extent of various comments here to the effect of "so-what". Then there are complaints, maybe even from the same commentards, that essential medical diagnostics of whatever are still running on XP. And, no, you can't reasonably expect that the customer will just go out and buy the latest whatever the chunk of hardware is. The old one may not yet have performed the body of work for which its purchase was originally justified.