Wouldn't it be harder to maintain relays and moving gears than some electronics equipment for which maintenance checks only involve running software through the

Wouldn't it be harder to maintain relays and moving gears than some electronics equipment for which maintenance checks only involve running software through the circuits and check if green lights are blinking on the other side ? My point is: isn't it far easier and more reliable to trust electronics than moving parts ? Moreover you can check out electronics as much as you want while mechanical parts would tend to degrade for each test. Disclaimer: I known next to nothing about nuclear plants and plant maintenance.