Yes it is a simply strategy that betters brood and half by a country mile, the same loooking for QC's between boxes to assess swarming issues but with the greater as said flexibility of having the same frame size.
Over wintering on DB simply means the bottom box acts as a larger bottom wind baffle , the bees will normally over winter in the top and any bottom stores will get used up later in winter or early spring once the cluster breaks. If one uses poly then they may not cluster very tightly at all.
The DB gives the beek a little more leeway early spring as to carrying out any manipulations, while the inexperienced fret about various techniques far too early that are disadvantageous to the bees.
The wiser beek can simply just heft the colony to ensure stores are still good and sit back and wait three or four more weeks until conditions are better.
Swarming if any may occur later in the season so one should see larger honey crops or they may just opt for superscedure in autumn but there is no guarantee that they won't swarm with the old Q, clipping will prevent losing a big swarm and if they play the game right will retain both Q's.
