Designers having that artistic taste, and clients lacking it, is exactly why I don't think generative AI is going to do much to replace (skilled) designers anytime soon. Likewise for other creative professions, and indeed for knowledge work in general.
Taste is a great solution for abundance, so I agree. Also, there's definitely a rubberband effect where products & designs need to differentiate on their design to stand out in a homogenous world, and you truly do need creative professionals having that judgment. Even using AI as a tool, you have to have the sayable vocabulary (at the very least) to agitate the aesthetic status quo.
And low-skill graphic design had already been mostly replaced by Canva, so I don't think AI is really having as much impact on the design industry as people might suppose.
Knowing what is in the realm of possibility can help you get much more out of genAI.
For example, you have to know about a style to know to ask for it or some variation on it.
I think we ALREADY at the point when AI is capable to replace like 99.7% of designers. It is only a question of market inertia and personal brands that prevent it from happening right now.