He appears to be tunnel-visioning on academia.

The vast majority (>75%) of Computer Science PhDs leave academia. [0] Becoming a "world expert in a specific topic" is overfitting skills for a sub-niche of a specific career. There certainly aren't enough jobs in academia.

[0] https://academia.stackexchange.com/questions/213640/what-rat...

You’re arguing that we have too many PhD students in CS, not too few.

I agree with you fwiw.