Why is there no generic operators ?

from blog Lisp journey, | ↗ original
TLDR; because the object system came afterwards (and it was not the intention to make CL entirely object oriented). As a CL enthousiast coming from Python, I feel the pain not to have generic or polymorphic operators but having to learn about many specialized operators instead. Why is it so and are there solutions ? I asked on SO. In CL, there...