Possibly the problem is the "V" in "A/V". AFAIK NAD was always an audio components company. Introducing video adds a huge amount of complication they were probably not prepared for. But that's just a guess.
As a counterpoint I have an NAD integrated amplifier I bought because it has a Chromecast built in. Even though it was a floor demo model it has never once put a foot wrong for me.
Then they shouldn't advertise what they can't deliver.
As time goes by you realize that what you thought were solved problems are not, and precious few people actually demand that they be solved. Precious few people (and almost no "reviewers") actually exercise the features advertised by vendors, and that they checked off on comparison shopping lists.
When you sell an A/V receiver that can't handle HD HDMI signals in 2022, you suck. You suck at the level of fraud.
As a counterpoint I have an NAD integrated amplifier I bought because it has a Chromecast built in. Even though it was a floor demo model it has never once put a foot wrong for me.