You never know if a wear leveling algorithm has been implemented so flash type isn't going to make lifetime determinable. Even without, 100 erases a day will last for 3 years or longer.
I would hope any monitor I buy lasts longer than 3 years.
I've been using my current monitor for ~10 years.
My monitors rarely last that long (at least, before I find it's worth it to upgrade), but like a lot of folks, I put most of my money into good monitors, keyboards, and color laser printers rather than the computers themselves, because I can generally get at least 5-10 years out of the peripherals. Computers themselves rarely last me more than 3-4 years, although my wife still uses one of my old Surface Pro 3s as her main computer - it's held up better than the SP4s.
If I could get a pair of Surface Studio touch monitors to dock with a Surface Pro/Book, I'd buy them, but yeah, I'd be real careful with them, too...
3 years... long enough that any warranty will have expired. I’m starting to see why the manufacturers would do this.