To me, those impressions are mostly consistent with the current comment,
“lack of soul or engagement."
@mitch2 Right- but apparently, only holds true for those examples. They don't represent all class D amps any more than saying something like that represents all class AB amps. And there are plenty of the latter that suffer the same problem and are bright and harsh to boot.
But there are class D amps that are as involving and as musical as the best tube amps, perhaps even better as just pointed out. The ones I'm playing at home are more revealing than the triode OTLs I was playing for years prior but just as engaging so I don't miss the tubes at all.