this looks like writing in the large seal script

What planet do you live on where people don’t care about healthcare funding and policy?

I’m not sure if there’s anything enable_if can do that concepts can’t do somewhat better but yeah there’s definitely a lot of subtleties that reflection is going to make nicer or possible in the first place

You already can do that with C++20 concepts and the requires expression

template <typename T>
concept has_member_foo = requires(T t) {
    t.foo();
};

// Will fail to instantiate (with nice error 
// message) if t.foo() is ill-formed
template <has_member_foo T>
void bar(T t) {
    // ...
}

// abbreviated form of above
void baz(has_member_foo auto t) {
    // ...
}

// verbose form of above
template <typename T> requires
    has_member_foo<T>
void biz(T t) {
    // ...
}

// same as above but with anonymous concept
template <typename T> requires
    requires(T t) { t.foo(); }
void bom(T t) {
    // ...
}

// If already inside a function
if constexpr (has_member_foo<T>) {
    // ...
}

// Same but with anonymous concept
if constexpr (requires(T t) { t.foo(); }) {
    // ...
}

C++26 reflection is compiletime