You're right Alan, of course. A well equiped studio can recreate most lighting styles, but I suspect that most of us won't have more than a couple of strobes and the odd reflector, so we are not going to be able to take advantage of such flexibility. I actually find that just using one strobe can be very effective for adding some drama, and it's much easier for my little brain to cope with.
That said, take a look through a copy of Vogue and see how many of the shots are done with a combination of natural and strobe lighting, or just daylight - it's lots. The picture editors and stylists know that you cannot get a diffuser big enough to match the one in the sky.