Calculus is necessary. It wasn't invented as a set of restrictions, it was just just discovered and formalized.
Haskell is not a discovery of something that already existed. It isn't the only programming language out there. There are dozens of examples of other languages that people use more easily. The problem was something invented, not something that has to do with the underlying principles of programming.
If there are easier ways of teaching calculus, maybe those should be used. Actually that is happening now as youtube videos and web pages help visualize concepts.
Haskell is not a discovery of something that already existed. It isn't the only programming language out there. There are dozens of examples of other languages that people use more easily. The problem was something invented, not something that has to do with the underlying principles of programming.
If there are easier ways of teaching calculus, maybe those should be used. Actually that is happening now as youtube videos and web pages help visualize concepts.