I really disagree there. The difference in quality between FM and DAB (not even DAB+) is very significant, and I’m not even an audiophile.
The problem is that 1) you don’t know it until you actually make the switch, and it’s not like you can borrow a car stereo system for a week to try it out, and 2) that’s pretty much the only advantage of DAB, from consumers’ perspective, so the price/value proposition is not good enough to make it a no-brainer purchase.