I’ve been using mechanical keyboards for at least a decade now and the only time I’ve had a switch go bad was when I spilled a drink on it. Technically it was still good but since it was a sugary drink the switch got sticky.
As many before me have said, I am a professional programmer. I don’t care nor have the time to replace switches. I have a backup keyboard that gets swapped in if a switch goes out. I’m never going to tear a board apart to replace a switch.
I spilled half a pint of beer into my kinesis advantage (cherry brown switches) and it worked fine after opening it and giving it a wipe down and letting it dry. Switches failing just isn't on my radar. I'd be more worried about the extra failure mode of the sockets needed for swappable switches. If it comes down to it I can solder in a new switch.
As many before me have said, I am a professional programmer. I don’t care nor have the time to replace switches. I have a backup keyboard that gets swapped in if a switch goes out. I’m never going to tear a board apart to replace a switch.