This makes sense to me, thanks! I primarily use Python, C++ and some Fortran, so my typical programs / libraries aren't really "pure" OOP in that sense.

What I write is mostly various mathematical models, so as a rule of thumb, I'll write a class to represent some model, which holds the model parameters and methods to operate on them. If I write generic functions (root solver, integration algorithm, etc.) those won't be classes, because why would they be?

It sounds to me like the issue here arises more from an "everything is a nail" type of problem than anything else.