Few reasons, some less valid than others.

• replaces GPL license with more permissive one
• wasnt broke dont fix
• missing some configuration features of base sudo
• C people feeling threatened by rust
• people hate rust's overzealous stans
• rust community is pretty queer, so being anti-rust is a nice proxy for anti-lgbtq

Computational theory would be a better name, but it overlaps with a more specific subset of what is normally called CS.

My CS program had virtually no programming outside a couple of courses where C was used to implement concepts. Had one applications type course where mostly Java was used.

CS is and should be a specialized math curriculum IMO. Teaching specific programming languages is time that would be better spent teaching theory that can't be taught by dev docs or code bootcamps, as exemplified by your anecdote. Unfortunately nowadays people tend to see degrees as glorified job training programs.