Agree with this - the more modern and capable the basic radiators are the better it works.
Our 30 year old house had original rads and generally limited to no per-room radiator override. The heating design seemed to be on the premise of a huge radiator in one room and heat leaching across the house to be topped up by small radiators in other rooms. As soon as you swap to room by room control that all falls over - the small radiators do their best but just don't cut it.
Another point I've noticed is that old radiators on full pelt tend to heat up the space around them quicker than newer ones designed to encourage heat convection up and over. In my case that meant the small radiator on full pelt warmed the HR92 next to it nicely which then cut the heat off before it had done anything useful in the room.
It's cost a bit replacing the radiators (always our plan so happy with that) but it has meant the EvoHome is able to work effectively room by room.