FWIW ...
I subscribe to both lists and forums, although I prefer to view lists as
newsgroups where that's an option (such as this list, which I access via
the GMANE group). A forum that supplies RSS feeds is not too different
in many respects from a newsgroup.
One advantage that I think a forum might have over the current
list/group structure is that on most forums (at least the forums I
visit), I can scroll down a thread and see all the message text in one
gulp. With a long thread, such as this one, I need to access each
message separately to read it, and I'm much too lazy for that.
That said, I have no problem with the current setup.
/Paul