If you want to raise my blood pressure Alfred talk about going treatment free for varroa /huge grin/
Letting the bees decide which size cell they are going to draw AKA bamboo sticks etc is certainly allowing them to do what comes natural.
Interestingly if you add undrawn foundation/bamboo skewers late summer all the cells are worker sized....
Do it in the spring and about 1/3 are drone.