Yeah, I've lost two modem/routers to power outage incidents, despite them being on a reasonable quality surge protector. But that was an all-or-nothing failure

Yeah, I've lost two modem/routers to power outage incidents, despite them being on a reasonable quality surge protector. But that was an all-or-nothing failure mode in which they would power up but never do anything else. Performance changes is a claim that requires much stronger evidence.