Is there a reason, why there isn't or shouldn't be
std::get_if<T>(std::any*)?

I believe both are based on boost designs, and boost::variant did not
have a get_if.

I would like to work generically with std::variant and std::any.

Ideally, type-erased types had a standard interface like containers, so
I can switch between
std::variant, boost::variant, eastl::any, etc in the same way I can
switch out std::unordered_map for the many available hash map
implementations.

I don't think the standard library provides strong guidance here for
interfaces that other implementations of the same concepts can adopt.