There's a very valid reason why you don't just turn off your computer by yanking the plug out of the wall socket - and flipping the PSU switch is the equivalent of doing that. Do that to your desktop computer a few times and see how well it runs as a result...
Yeah I have turned PC off GPU rigs at the switch a couple thousand times. It is a non-issue. There is a reason open frame GPU miners used power supplies with a physical power switch on back. The theory that it powering off highly regulated UL listed ATX power supply destroyed connected equipment doesn't hold water.
There are ~300 million PC in the US. If yanking the power would blow up a motherboard 1% of the time and the average PC experiences 3 blackouts a year then you would be talking something on the order of 9 million destroyed PC every single year. Say average PC is $500. We are talking about a half a billion dollars. If it genuinely was a problem then PC mother boards (and GPU and other hardware) would come with circuit breakers or at least a $0.20 quick burn fuse. Of course they don't ... because it isn't a problem.