100% agree with the org shift, but I think of things differently. Specialists are important for architectural insight and domain expertise, but are also the byproduct of codebases growing past a certain size.

It starts with "I know/can handle issues from infra to design" to regroupings of focus, often DevOps / code / design. But companies also might split focus by user concerns, like the "Admin console team" vs. "End user team". That depends on the product and the complexity of the specialist concerns.

I think across the board there is going to be a blurring of management and engineering. We see the value of "product engineers" now but they are starting to eat some of PM's lunch. On the other side, "technical PMs" are more valuable, as they come at things from the other side. The driver for this change is that both are using a shared context to bridge the gap from "business concerns + product requirements" to code.