Lambdas. Concepts. Ten types of casts. Templates of templates. Everything and the kitchen sink is in there.

You need a language lawyer to figure out anything but the most basic interactions. For example,

1. What's the practical difference between an abstract class and an interface?

2. When do you have a copy constructor run instead of a cast on initialization if both are defined?

3. When would you use a non-virtual destructor?

What happens when you hire people? Isn't it better to have a small language that everyone understands in its entirety, and has to go out of their way to surprise you?