Most of us can't afford (don't spend the money on) a turret lathe. The depth problem can be solved by mounting a digital caliper on the tail stock.
Yes, if you do a fair amount of ctr drill, drill, tap on your lathe, it's worthwhile. Unless you have a heavy duty lathe l wouldn't think of trying to cut an OD with a tailstock turret, though. (A box tool on a turret lathe may have two cutters to keep it centered on the work. ) Truth be told, I do have a turret lathe in addition to my 10-30. its about a 6 by 12, but with a collet chuck. And yes, I do production on it. sometimes as many a 20 pieces in a run.