What is the point of `std::make_optional`

One example of the difference is when you want (for whatever reason) to make an optional containing an optional:

#include <optional>
#include <type_traits>

int main()
{
    auto inner=std::make_optional(325);
    auto opt2=std::make_optional(inner); // makes std::optional<std::optional<int>>
    auto opt3=std::optional(inner);      // just a copy of inner
    static_assert(std::is_same_v<decltype(opt2), std::optional<std::optional<int>>>);
    static_assert(std::is_same_v<decltype(opt3), std::optional<int>>);
}