Funny I’ve had people tell me the exact opposite they like to move the queen to a new location with some young bees and let the parent colony make a new queen.
I didn't know there
was another way of splitting a colony ...
If you split a colony and place the queenless 'half' on a new stand, then that mini-colony is "up a creek without the proverbial paddle" - for it has neither foragers nor a laying queen, and will be a ripe target for robbers while a new queen is being created - which takes some 4 weeks from egg to laying. (unless the beekeeper provides a mature queen-cell, of course)
If, on the other hand, the existing queen is included in the 'half' on the new stand, then - providing enough bees remain of course - some nurses will be elevated to forager status much earlier than usual, and with the queen on-board life will return to normal fairly soon - albeit with a smaller workforce for a while.
In the other box - still on the original stand - there will be both the nurses which have remained together with the full workforce of foragers. Some of the foragers (the younger ones) have the potential of reverting to nursing functions should there be a need for those. All-in-all, that 'half' of the original colony remains a powerhouse, well able to create a new queen and defend itself until such time as she becomes fully functional.
Without a queen, that 'half' of the colony will of course be set-back by around 4 weeks - that's the price to be paid by not engaging in the practice of queen-rearing ... and which is why beekeepers do it.
LJ