I started doing it after I'd seen several swarms already. Colonies were building multiple cells of different ages.
Taking out the queen wont necessarily stop them swarming if there's any more than one queen cell on the go. Although you'd get to keep the first queen.
Separating the queen and most of the flying bees from the brood like a swarm does - gives the bees the conditions as if they'd swarmed already.
Also, provided you have enough hives, if you take the queen out and the ripe cells and put them in nucs, then you can come back and get the new batch of capped cells to put in nucs. With some capped brood and some honey and pollen. If conditions are good; drones, warm weather; after they emerge, you get several new queens from the desired mother, crossed with local drones, to start new hives.
Only makes one hive queenless to make quite a few queens, instead of splitting each hive into two or some other methods of splitting.