Digital thermostats for underfloor heating: useful? Is the extra cost justified?

Digital devices are supposed to be more prone to malfunctions.
Don't remember where I read that anymore.

What disturbances are wall thermostats exposed to?

They burn through.
( stinkt verbrannt) no idea if that's really more common with digital ones.

Ultimately, every RTR is only as accurate as the measurement technology it contains. And the range of room temperature fluctuations depends on the size of the control hysteresis. Both can be good or bad in digital as well as analog thermostats.

We already use the RTR a lot. The bedrooms and children's rooms are usually set to 18 degrees. The living room is throttled at 22 degrees. The bathrooms always have full flow and thus reach around 25 to 26 degrees.

They burn through. (smells burnt) no idea if that's really more common with digital ones.

Yes, that is rather a rumor.

Ultimately, every RTR is only as accurate as the contained measuring technology. And the range of room temperature fluctuation depends on the size of the control hysteresis. Both can be good or bad in both digital and analog thermostats.

There is really nothing more to add to that.

We already use the RTR a lot. The bedrooms and children's rooms are usually set to 18 degrees. The living room is throttled at 22 degrees. The bathrooms always have full flow and thus reach around 25 to 26 degrees

Hmm, when reading it gives exactly the impression I know or that is often talked about here in the forum. The thermostats are permanently set to one value and are simply not used.

Or do you really use them and occasionally adjust the temperatures? Meaning 18 in the bedroom today, then preferably 20 tomorrow, and 16 next week?