Do not step on it, since the stairs in modern houses nowadays are designed to be open and thus constantly surrounded by the warmed air. They therefore also take on the temperature of the surroundings.
Oh ... and in the bathroom the shower area does not take on the temperature of the surroundings, or what? The stairs will hardly ever be as warm as the floor with underfloor heating, since the floor with underfloor heating is always warmer than the room temperature. But I do not (necessarily) want to continue this discussion. I have learned that it is nowadays common, at least in new buildings, to equip the shower area with underfloor heating. We did not do this during the renovation on the advice of the specialist and do not miss it either. Everyone else can be satisfied and happy with the two or three seconds of warm floor in the shower ... :)
Then just remove them completely and go fully electric if they are only rarely on anyway. That way they won’t ruin your balance and you will need less technology and hydraulics overall.
I will consider that when the time comes. Thank you very much :) At the moment our oil tank is still full. So it might become interesting in two years. I just don’t understand yet why the radiators, which are rarely on, ruin the balance. You have to produce hot water for showering etc. anyway, and the radiators are never really hot for long.