You have both the Import wizard for mass imports, and the Assets Library page for file management (which allows you to do some things than no file manager could).
I think that, as @divado mentioned, you seemed to only be looking at the file browser from within Foundry itself, which is indeed quite limited in what it can offer you.
As for adding support for something like FTP, there’s a response in the FAQ for why that wouldn’t happen, and I explained in more details the reason why in this comment :