> He could have delegated the design of the first font for his TeX system to a professional type designer.

Knuth started work on TeX's fonts about the same time that he began work on TeX and Metafont (1977-78). CM was largely completed by about 1984-86. He was a computer science professor. I'm not aware of any funding he procured to develop TeX. You're saying he had the financial resources to hire a professional type designer for fonts for an academic publishing system of unknown future?