It's actually worse. The current generation of professors is completely out-of-touch with industry, due to them living during a huge academic shortage. Now you hear them say:

- "I never wrote a patent and I turned out great. Why should we bother giving an innovation course to our PhD students?" - "This person had a 10-year break in their academic career. I can't evaluate them."

So it's not only that there is a lack of mobility between industry and academia, rather this gap is actively fueled.