Having tried the thing, it seems best summarized - currently - as "This thing is a GUI, written in javascript, allowing a user to view and manipulate the contents of a browser's origin private file system (OPFS)."
Did I get it right?
Also, what, exactly, would be its use case(s)?
You seem to be of a similar generation to me (Gen X)? So like yourself I grew up through those halcyon days of ZX81s, VIC-20's, Amigas and so on, as well as various flavours of Unixen, and finally Linux these days. I just don't grok the relationship between the aforementioned word salad introduction, and whatever the usefulness of this Thing could be.