As usual, ISP disappeared, so this is half an hour late!
Ron Brown
Whoever he is, is wrong - unless simply a personal opinion.
If funds are limited, or the beekeeper is careful with his funds, swarms can be a good thing. Apart from the 'unknowns' of such a colony - health, age of queen, traits - there is little to lose. The colony will build wax very quickly, initially; varroa can be reduced to a minimum effectively and easily in the 'season' and they can be incredibly cheap.
Swarm collection can be a pain (bumbles and wasps, access, distance, timing), but bait hives require little attention after setting up.
Lastly the queen can be replaced soon after, so the traits can be redirected, even before the keeper knows all of them!
So, in my view, swarms can be a valuable asset, but everyone to their own. I have found them all of the above, but that would not stop me collecting a good prime swarm.
Regards, RAB