Earlier quoted context omitted.
If this is the best argument one can come up with for not being critical here, for me it absolutely proves we need to be more critical here. Of course, I don't wish to see anyone suffer, but I'm seeing something like: "Hey, we're paying a guy to dig holes and fill them back up with no value whatsoever, why are we doing that?" "Hey, man, stop attacking hole-diggers, they're just trying to make a living."
Can you go into more detail of why you think we need to be critical of designers? The GP makes no effort to justify their criticism of designers, perhaps you can provide some reasons for it, and thereby allow people to respond to actual arguments.
The justification isn't "It helps users" or anything like that. It's "This is not a new idea either — pretty much everyone else is doing it, e.g. macOS, Windows, iOS, Android, elementary OS, KDE.". Reducing usability and breaking habits to follow trends is a bad thing.