Yes, but OO languages create the same spaghetti-code morass that imperative languages did.

As opposed to, say, functional languages, for which it seems far harder for some reason to create spaghetticode

Some of the cleanest code I have ever seen was written in C/C++. And some of the worst spaghetti-code I have ever seen was written in C/C++.

Bad developers write spaghetti-code. Languages don’t write anything.

Out of curiosity, can you point me to some of this very clean C/C++ code?

It’s all proprietary unfortunately. However the Doom C code available online is nice and clean.