A full article on what went wrong at Logitech corporate could be enlightening, if not helpful.
"Can't be accidental" reads as conspiracy-huffing. Lemons exist, bad products happen, but this is a weird assertion without evidence. Like, I got bit by the MX518 double-click bug back in the day, but everything I've used from them since--and I won't buy Razer because their stuff's awful to look at, which has historically cut down the options a lot--has been unremarkably fine. Except for the MX Ergo. That thing is remarkably excellent.
Whirlpool refrigerators have a "light control" circuit board to make the dome light come on slowly when the door opens. It has two resistors carefully underspecified to fail after warranty end, requiring a $150 replacement board. (Lots of pics online.) Good for them, bad for us. A $2 transformer and diode would last forever.
Whirlpool washing machines have a Motor Control Unit board carefully designed so parts on it literally explode shortly after warranty end, requiring a $300 replacement. (Lots of pics with exploded parts online.) There is of course no need for the parts to explode, and commercial washers from the same manufacturer do not share this failure mode.
There is literally no legitimate reason why moisture on the bottom surface of an optical mouse should possibly have any effect on its operation or longevity.
Sure there is. You got a lemon with an unexpected gap in the base panel and electronics don't like water much. That happens; that doesn't mean it's a defect by design, and the shouting about it needs a lot more substantiation than "well have you heard of this thing in another industry entirely?". Tolerances exceed, stuff breaks, warranties are sometimes necessary. This sniffing about capital-P Planned capital-O Obsolescence when this stuff works in the main quite well for a lot of people (and, as mentioned, my own pretty wide array of hardware from them) has a long road to hoe to substantiate it.
You buy a dishwasher once a decade or so. You buy mice rather more frequently than that. From where I sit, there's more incentive to hand you a decent product so you come back and buy another from the same manufacturer--and, as it happens, that's much of why most of the input devices kicking around my house and my studio are Logitech, because they're generally a decent floor of quality.
Your Pollyanna view of consumer electronics and appliances is at variance from the reality. Are you by chance Libertarian?
And, uh, no. I am very far from a libertarian. I am not, however, inclined to jump at shadows.
Great mouse but always am missing the scroll wheels from the MX Master. As soon as they release a new MX Ergo with upgraded wheels, I’ll be upgrading. Just smoosh the two together and it will be excellent.
In other words - your best bet is still replacing the switches to ensure longer life... I wonder if Logitech would ever consider stepping the voltage via capacitor charge pump to prevent double clicks.
[0]: https://omronfs.omron.com/en_US/ecb/products/pdf/en-d2f.pdf
I use Microsofts $5 "Basic Optical Mouse" mice now, which generally me for years and is surprisingly comfy (though typical $5 creaky plastic). I have RSI so I'm fussy with mice but this one is pretty good for me. So even with beancounting it's possible to make a quality and lastign product. I've only had to replace two of them in the last 10 years or so (and I have 6 of them in use). Both were still working even but the plastic was just getting too creaky and glossy from all the use.