but a more laggy throttle response.
On a multicopter, the motors must be able to vary their speed very quickly in order to maintain stability, it's the only thing keeping it level.
However some of the full size VTOL seem to manage.
It seems it's less of a problem if you have just one engine...
In this case the airflow from the propeller over the control surfaces is enough to stabilise the plane, the engine doesn't have to vary it's speed very much because the airflow is then controlled by the flaps.
There have been a few multicopters that use flaps to control airflow, but mostly for yaw control and just directing the flow not restricting/opening it.
I think there are a few projects that use flaps on all motors.
Another way would be to have variable pitch blades like on helis, but that adds a lot of mechanical complexity.
This should really be a separate thread by now