There's Class D and there's Class D...
Most Class D amps are analog, but I had a NAD Masters Series M32 digital Class D integrated for many years. I thought it was great, until I switched in a Modwright KWH 225i amp, which is Class A/B with a tube front-end and a solid state output stage, operating in Class A for the first 25 watts.
It was the single-biggest sound quality improvement I've ever made to my system, providing a much greater sense of control and heft and a smoother, purer-sounding top end. I don't know whether it is because of the triodes, the extra 40 wpc, the analog signal path, or the A/B operating class.
That said, I'm also intrigued by some of the newest Class D designs, and I believe that there are still breakthroughs being made which will benefit all of us. Progress continues even in Class A with companies like WestminsterLab, whose compact 35-lb Class A monoblock is being embraced by many ultra-high end enthusiasts who normally stick with 100-lb + monsters.
These are exciting times, and I think that the key mindset is to be open to the future, not mired in the past.