It keeps the riff raff at bay. SxSs are even better at this.
(If you buy a cheap O/U, the knowledgeable folks will NOT be impressed)
I guess it all depends on who you're trying to impress.....or IF you're trying to impress
One reason I never got a O/U, though, is that I could get a nice autoloader for a lot less money than a plain O/U. Too, I have a hard time finding a double that fits. I have a couple of inexpensive SxSs. The old 12 I bought in 1971 when I didn't really understand fit. It kicks like a mule because it's relatively light, but mainly because it doesn't fit me well. The other is a little spartan 20 which was sloppy enough fitted wood, I was able to fit it pretty well to me with shims. Won't impress anyone with looks, but it does shoot quite well and it's built tough enough for me. But, the Yildiz, one that I know is serviced by Briley, not far from me, just doesn't fit and the wood fits nice enough that adjusting it with a shim is out. I also shoot lefty and off the shelf doubles are often cast for right handers, A Franchi Instinct (1000-$1500) is one relatively cheap O/U that seemed to fit me pretty well in the gun shop.
I have two pumps and an auto. The auto is perfect, cast neutral and just perfect drop. The two Mossbergs are my waterfowlers and had to be shimmed to fit, but that's quite easy to do with a repeater.
Cost of quality O/Us ain't really that bad and what with all the hand fitting and barrel regulation required of a quality double IMHO. 3K ain't bad. Start lookin' at SxSs. THAT's what's STUPID. What is a SxS, but an O/U turned sideways? Yet, they're 10 times more expensive for a comparable gun. This is sorta what makes me wanna get a quality O/U, it's a bargain by comparison! I wouldn't take it waterfowling, not in the salt marsh, maybe upland in more sterile environments around here. But, my pumps and auto serve well for that. If I get one it's just going to be because i've always wanted one, not because I really NEED it, 'cause I don't. The guns I own now serve me well for my hunting. I'm not a clays shooter and don't put on that many rounds per year, so I ain't worried about wearing anything out in MY lifetime. I might have 20 years of shooting left....maybe. If I get an O/U in the future, owing to the fact that it'll mostly be used on doves, I'll PROBABLY get it in 28 gauge. Never had one and everyone seems to think they're pretty effective dove getters. They should be easy on the shoulder and the guns, if made on a 28 gauge frame, should be light and quick.
Light and quick is good on doves in certain situations.