I disagree with the "freeze the brood frames" bit. You're talking about frames of capped brood here. A lot of resources have gone into that frame to get them to that stage. Might as well throw money in the garbage. IMO there's always room somewhere for a frame of capped brood.
If you only have two or three hives? No, there isnt always enough room for capped brood. When you have hives on the verge of swarming, and nucs that are about to overflow as well, you need to do something.. I suppose you could always just let it happen and throw your money in the garbage when they ALL decide to swarm.
Not everyone has a dozen hives or more. Not everyone wants to keep creating more and more nucs/hives.
Dont forget the entire purpose of keeping the nuc in the first place. YES, it is to use... To take resources from INSTEAD of the production hive. it is meant to be used to FIX problems, from a weak hive to a queen less situation.. We have all been there. But, there will come a time, when nothing needs fixed, no queens need replaced, and your hives are all strong and booming... Especially if you only have three or four of them!
You dont want more hives. You dont even have the equipment for another hive, and you dont know anyone that has the equipment or wants another hive/nuc. The solution is to begin pulling an occasional frame of brood. Not ALL of the brood, but enough to maintain the hive at its current level. You want the older bees replaced, but dont want them to gain more of a population... If you dont do something, they will swarm. Swarming IS the goal they have set their sites on... It would be nice if you could have a chat with them, and explain the situation, and get them to agree to cut back and maintain, but its just not that simple... waste a little brood, or lose half your production hives and nucs.
I dont like it either, and I usually have some place to put brood, but like I said, if you have only a few hives, andeverything is going too well, you have to make the choice on what to lose.