Ive had this discussion many times. And some are open to understanding and others are not. It is all good - we all use what we think is the best method(s) for the job at hand.
In our shop we use dowels, Lamello biscuits and Festool Dominos. All three fairly regularly. But for many different applications.
Dowels are the cheapest and fastest for case goods, since we use a stationary boring machine. Donimos are very handy for more structural type joinery, or to get into a tighter area, deeper.
Biscuits are still so very useful - and cheap. By the box of 1000, our cost is approx 5 cents/unit. And the machine makes the slot accurately and very quickly (I wouldnt even consider using a router..).
Dominos on the other hand are about 26 cents for a 8x40 or 8x50 per unit. The machine is not as fast either. So when a biscuit will do, why use the Domino?
I still like dowels if we can get what we need on the machine. But again, everything has its best use.
After 30+ years using them, I can't see getting rid of the Lamello machines any time soon.