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Water + electronics/power typically isn’t very durable, or reliable. Most people want their shower valves to work at least 20 years, ideally 50-100.

Can be mitigated to a degree by separating the (cheaper) sensors and the (pricier) logic.

But then it will become a tradeoff of complexity vs longevity.

Nah, because it would still need servicing.

And why? There are reasonably well done, low maintenance, temperature balancing valves out there.

And they do typically last 20+ or more years.