There isn't any real proof that dsb is bad.. for every "crash" there are 10 year success stories. Alot of it is that people neglect their tanks, brag about lack of water changes, and it bites them in the butt later. It's the "it makes your tank crash" flavor of the month.
Bare bottom tanks were successful before sand was in vogue. It works fine. Ugly. Refugiums even date back to the Bare Bottom era. There is more than one way to skin a cat.. do it how you feel comfortable, and if your husbandry is good you'll be fine. A top notch aquarist with little equipment can do wonders.. a poor or average aquarist with all the high end stuff and current "best method" often fails, and when they do, they latch on to something to blame. The internet being what it is.. bandwagons ensue. In a year or 2, you'll see plenty of people with BB tanks fail, and blame something else. Nature of the hobby. I'm not trying to sound harsh, that's just my experience from years of watching the hobby.