While this is a great article, I feels it buries the lede.

For me, the key insight was from the last paragraph of the article:

C++23 introduces "deducing this", which is a way to avoid the performance cost of dynamic dispatch without needing to use tricks like CRRT, by writing:

    class Base {
    public:
      auto foo(this auto&& self) -> int { return 77 + self.bar(); }
    };

    class Derived : public Base {
    public:
      auto bar() -> int { return 88; }
    };

I wish the article had gone into more details on how this works and when you can use it, and what its limitations are.