There is a lot of total nonsense posted online regarding many topics, including Class D amps.
Are people threatened? Fearful? Did they just hear a bad setup which no one technology alone can fix? Did they just prefer something else in their case? Who knows.
I have Class D amps ranging from $80 to $6000 retail. They all sound top notch used properly in the right application. Just like anything else. Any new amps I buy in the foreseeable future are likely to be Class D or similar as well.
Does not mean they will be everyone’s cup of tea since personal tastes always vary.
But to diss the technology categorically as not worthy for consideration is just a huge mistake. It is most worthy with a very unique set of advantages and little if any downside, personal preferences aside.
Personally I bless the technology. Just apply it wisely. Nothing new there!