Infrared heaters throughout the entire house?

In an emergency, a gas-powered patio heater will do :D

That's right. For every use case or idea, there is also the appropriate horror story, and usually everyone defends their own model.

Thanks for that!! There are several systems for a good reason. Just because I don't want underfloor heating with a heat pump DOES NOT mean the system is bad. It doesn't fit my requirements, preferences, and ideas. Quite simple. For other families, this solution is practically ideal.
Putting aside the economic calculation for a moment, underfloor heating produces a different kind of heat than an infrared panel. Different does not automatically mean better either. I have people in my close environment who have difficulty maintaining their mood, zest for life, and performance during the dark time every winter. Exactly these people are helped by two things: light and directly perceptible warmth on the body.

In an emergency, a gas-powered heat umbrella will do too :D

There is some truth to that.

There are several systems for good reason.

Just THAT is what I want to express with some of my posts, and some make their decisions less based on calculations and more on feeling. For us, it was clear from the start, for example, that it would be a massive plank floor and also without underfloor heating, although I had considered it. Still, I can just as well understand other approaches.

That I do not want underfloor heating with a heat pump DOES NOT mean that the system is bad. It just doesn’t fit my requirements, preferences, and ideas. Quite simple. For other families, this solution is downright ideal.

Exactly my way of thinking, and it also doesn’t hurt to not dogmatically uphold one thing while devaluing the other at the same time. It should fit your own life, and ours differs from the "typical" family life just as much as the way we deal with room temperatures. What actually surprises me is that despite existing human diversity, sometimes surprisingly little individuality shows when it comes to building houses. I always find it interesting when someone does something different and am curious about it.

Putting the economic calculation aside for a moment, underfloor heating produces a different kind of warmth than an infrared panel. Different doesn’t automatically mean better.

Currently, with underfloor heating, it is often the case that I have to “air out” heat when the temperature changes (I read this term here in the forum :D), which is probably due to the system’s inertia that I find unpleasant. Therefore, alternatively, I would also have chosen heating with nice radiators.
We are definitely deliberately installing a panel radiator on a wall that you can sit against. Is that reasonable in terms of calculations/technology? No idea...... but nice!
A planning mistake is only one if it does not fit one’s own life.

Yes, that would be an idea. But you would probably need a power outlet for that? There really isn't any space for that anywhere in our bathroom arrangement.

There are infrared panels in mirror form. You can take the power from the light behind the mirror or from the socket for the shaver and replace the mirror with the heating element.

Not from the burning point, because it always switches on and off with the light

So equally demand-controlled? That's great!

Not from the ignition point, because it always turns the light on and off

No, that can be fixed. The switch is converted into a wireless switch for the light, continuous power is passed through to the infrared panel, and the control is handled by a wireless thermostat.