The thousands of playtesters don't count.
Yes they do, which is why 5th edition is a much better game. They didn't just ram everything through without any feedback or consultation, and that's why customer satisfaction is much higher this time around. The sales will reflect that, believe me. Or not.
Internal playtesters and QA do very much count, they are a crucial part of any team. External beta testers or focus groups also matter, not to the extent that you give them all credits in the game by name, but at least give them credit in principle for having contributed. At least a shout out.
I guess you tend to minimize the importance of the public playtests because you disagree with the results and the final game. It's not perfect, but it's loads better than all prior editions probably. We will see how the book sales are in a few years, and then when the dust has settled, you can either accept reality that designing a game that people will like by, well, asking them what they liked or didn't, will result in better sales.
Had they done an extensive public design phase for the previous edition, the result would have been much different.
For starters, they wouldn't have given lizards mammaries. It was such an insult to people's intelligence, very cartoony and silly. And I liked dragonborn other than that. It just felt like it was catering to the manga / in-betweener market.