Very true.

The Agile movement disconnected product design from product development. That was a great dysfunction. By the 90s product design was very sophisticated. Then came Agile and snip - no more product design (except at companies that ignored Agile, like Apple). So instead of figuring out how to do product design in an Agile manner, it was simply discarded.

Today people are trying to add it back, which is good.

Scrum is an example of an approach that dismissed product design as if it is extraneous or something you can tack on. It is not - it needs to be central.

Ironically, the original paper that described Scrum (which was quite different from what Sutherland and Schwaber cooked up), they point to the IBM PC team as an example. That team was very eclectic and a lot of attention was put on product design. But the way that today's Scrum is defined, everyone on the team is the same. That is not how Scrum was originally described.