ᐅ Heating circuits/thermostats for living/dining/kitchen areas with underfloor heating/heat pump

We have the following question. Is it advisable to install separate heating circuits with individual thermostats for an open-plan living/dining/kitchen area (40 m² (430 ft²) + 14 m² (150 ft²))? The energy source is an air-to-water heat pump. As I understand it, this is a low-temperature heating system that should heat the entire space — which, from my point of view, is the whole open living/dining/kitchen area — as one unit. It’s not about having warm feet. Our builder has proposed three heating circuits with three thermostats. We are wondering whether this is really necessary or if we could save costs here. From your perspective, is there a good reason to install three (living/dining/kitchen) or perhaps two (living/dining and kitchen) heating circuits?

Thank you very much!