For sure you are right for protection aspect.
If i was leaving in a location prone to sudden tempest any hours of any day i will do the same, nevermind a bit less satisfying sound, but i am lucky where i live is relatively calm and thunderstorms are previsible in some way.. Then i disconnected my amplifier ...
Any surge protector with series mode protection has excellent noise filtering built in, due to the nature of the protection. Furman with LiFT adds linear noise filtering.
Regardless if what others say the "rule of thumb" is, I surge protect everything due to living in an area with continuous affronts to the electric grid. Damage warranties are almost never enforceable and I don’t want to go through the hassle of repair or replacing anything.

