I think there's a prety simpl explanation.

When I add an additional runtime, the runtime is IN a named folder. For instance, my warcow runtime is called Warcow.

I don't add the actual runtime, I add the folder it is acxtually in.

In poser's libraries, it shows up as Warcow.

I COULD rename the runtime folder itself but want to know there a runtime folder somewhere, not poke around in it, to see if it actually is a runtime folder.

It make organisation and management easier for me.

Maybe that's why?

Way too many people take way too many things way too seriously.