Boiler Min Output vs Per Room Zoning.

Hi All.

Was wondering if anyone had any advise on the following, I was looking at the Honeywell Home Evo System where each room becomes a zone in its own right, but what confuses me is that these per room zones don't seem to account for the miniumum output of a boiler, for example what happens when a gas boiler ranges down to its min output as a single rad is calling for heat. I.E. they seem more suited to European setup in apartments with shard boilers.

Assuming it's a modern condensing one would it stop condensing causing the efficiency to fall. It seems to be a trade off between convenience and keeping the boiler above it's min output from reading some UK forums but its unclear.