[dunefox]

> because making solutions is a lot of work!

Imagine how much more work it is to try to solve these exercises then. Exponentially more than creating solutions for someone who already mastered this topic. This tells me a lot about how a teacher thinks of students.

[yshklarov]

> This tells me a lot about how a teacher thinks of students.

This is quite an uncharitable perspective!

[dunefox]

It comes from experience. I had several professors who did not even release the script for a course, much less the problems and never solutions - everything had to be written down by hand by students while you were supposed to listen, understand, and ask questions. If you couldn't read something or were too slow, you could not study this part.