Importance of recapping a SS amp?

Caps are more prone to failure and need of replacement if the are forced to sit for long periods of time (years) without use, that is the most redicoulas statement of all time!, the more you use and drive hard the amp, the sooner you have to replace caps!

Audiolabyrinth, from the user's perspective could be anything, from the one who fixes electronics, it's a-bit different and not so redicoulas or redukolois at all.
On one of the Kenwood receivers I was always loosing one or 2 caps once put back PCB together after fix. It turned out that all of them needed replacement after sitting and not using.

All amps age differently depending on design and use. The deterioration is slow and gradual. Maybe your thoughts were started by hearing some subtle differences. Again, Odyssey can best advise you what to do.

Boat engines need using also....just sayin...

Jl35, exactly right !
Time and again I've listened to systems where the owner says said amp is 18 years old and good as ever.
It never is but, as you say, he's so used to the gradual decline he can't hear it.