With our machines getting older, just what are the main issues in maintaining things in good working order?
....... but I just LOVE my Amiga.
Commodore farmed out the manufacture of the keyboards to a number of different companies. Some last longer than others. Having a spare might be a good idea. I personally love the Amiga's keyboard ergonomics.
The original mice are spotty in their longevity, too.
1084 and other compatible monitors are getting in short supply.
I haven't encountered any problems that could not be repaired or worked around.

I intend to keep them working for as long as I am. My real concern is the logical end of the Amiga time keeping. No one talks about this.