Not a physicist but I did study a degree in it. Spin is absolutely a direction and absolutely related to angular momentum, since it's basically the angular momentum that you get when all the angular momentum we understand is removed.
There's a reason it's called spin! I think what you're trying to get at is that it can't be understood in the traditional context of an object spinning, but the way that you're saying it is wrong.
There's a reason it's called spin! I think what you're trying to get at is that it can't be understood in the traditional context of an object spinning, but the way that you're saying it is wrong.