"you need someone with technical expertise who speaks enough "design" to communicate with the designer "
Something I've clearly never learned looking at the years I've spent banging my head against the wall with designers who do not understand the concept of DPI. A typical example:-
Designer: I need all my photography images to be supplied at 300 DPI.
Me: What resolution?
Designer: 300 DPI......
Me: 6" x 4" at 300 DPI, 10" x 6" at 300 DPI, A1 at 300 DPI?
Designer: Look, they just need to be 300DPI then they are good enough to print out.
Me: You've saved 1TB of JPGs twice and filled up the entire NAS, one lot at 96DPI and the other at 300 DPI, but they are both just 3800 x 2100 images.
Designer: That's because the ones at 96DPI are for use on the website, the 300 DPI are to be printed.
Me: But they're identical, you only need one set.
Designer: No, they're different resolutions, those are the same resolution as your monitor, those as your printer.....
And many many more....