That’s not a small cycle count for a normal household. 90 × 24 = 2,160 total hours.

I sous vide now and then, about twice a week for 6 hours each, so around 12 hours a week. That works out to roughly 15 years of usable machine time for the average person.

Not bad at all.

Photography is the same way. Most SLR / DSLR / mirrorless cameras have a mechanical shutter which is expected to last around 200k-1m activations. I've had a camera for a bit over a year. I've used it quite heavily, and my shutter count is at about 13k photos. At this rate, the shutter will probably last for 20+ years - which seems fine. If I'm still using the camera by then, spending a few hundred dollars to replace the shutter mechanism sounds totally reasonable.

2160/12 is 180 weeks, or roughly 3.5 years, not 15 years

Assuming linearity, which I doubt is the case.

You think a measly 360 uses at your 6 hours typical operation is even remotely acceptable for a glorified heating element?

And yes, 15 years is bad. I don't want to replace my entire household every 15 years FFS.