You wanna know what's great about actually employing someone? They can actually devote their full attention to you. They'll also get the door for you; can Magic+ do that?
That person you hire can't split themselves into 10 people on demand, nor are they easily replaced if they go on vacation or get sick. This seems to me the PA equivalent of using AWS rather than owning and maintaining your own servers. There are some potential drawbacks, yes, but there are also a lot of potential upsides, depending on your needs.
