Well, it is kinda nice to know when to expect an update (on a weekly schedule or daily).
As far as reaching 4.0 goes, it's nice to finally get off the pot and produce something. I mean I know numbers don't mean anything really, but it's very important to state that we (community) or we (devs (which I am not)) have produced something and it's a live progressing distro. That is usually measured by how long since the last number roll, and 3.999 ->3.9999 doesn't cut it.
It also has that side effect that probably a new ISO is released soon too (which is always nice for installls/reinstalls).
