For me, C is perfect and just works and C++ doesnt. That being said, both their std libs are a big mess. It's absolutely horrible. The problem is the macro preprocessor. It's a horrible feature that should not have existed.
C++ STD lib is not a big mess. At least, I am using it for decades. I don't know if you really used it because those who are against STD doesn't understand the point of abstractions and it's utility. They always tend to cite why would I use vector when I can create a "simple" linked list myself with pointers.