A lot off other gear with capโs in is fine with switching on and off
Yes but competing compromises. A large surge current on switch on tends to strain many components - especially those in a series load. So regular power cycling may shorten the life of other components - whilst others are lengthened.
I think it is worth taking a moment to remember why Naim equipment and others are kept switched on. A clue, it is not about the longevity of caps, it is about sound quality and the gear ready to play at its best whenever you want it.
And as long as their service policy, and ability to deliver that policy supports this, not a problem.
This is were statistics is useful.
Electrolytics powered 24/7 are bound to go off, with in a known time frame. 100 percent certainty.
Failure due to switch on, may happen after 5, 10 or 100 years. Failure rate is more random.
You already now what that policy is if you wish to know more or in detail I should call Naim directly as you will not get a complete answer here.
As @Simon-in-Suffolk said it is a compromise. No right answer, just an answer slightly better than the others.
But, it doesnt matter. Just get it serviced every 12 to 15 years. It helps prevent failure and restores to design. Simple, or so youโd think.