For example, my zoning panel (WaterFurnace IntelliZone) directly adjusts the blower speed and directly adjusts the compressor stage, as a function of a few parameters, including number of zones calling for cooling/heat. Not nearly as elegently as an Infinity controller, for example, though.
And I think that any zoned system with a variable speed blower is going to have difficulty with a bypass without the damper motors having some special control (like EWC does). My WF IntelliZone zoned system too does not have a bypass.
(I've learned proper duct sizing is even more critical with a zoned system that has a variable speed blower. The smallest zone must still be able to handle the lowest possible blower's CFM.)