Yes, it's probably fair to say the actual situation is far more complex than my outsider summary suggests.
Still, even though I discovered that a cleaned up RMSS is what I wanted, I could have understood something more heavily rooted in RM2. I don't really understand what audience they're looking for with some of the stuff I've seen in RMU -- it seems to be built specifically to appeal to a small subset of the existing audience, and that's a bout it.
Of course, it's also true that I haven't looked all that closely -- I checked out some playtest documents a long time ago, and never looked closer or followed things after that.
My goal for an RM Revision was to make it more like RM Express (which actually turned out LOTS simpler than HARP), but then to have an option that could swap out the entire skill system to something more RMSS-like with a simple conversion for it (that would allow ICE to focus on a single version)
The folks currently running things did not like that idea (mostly because the revamp would have ICE likely dropping HARP products in the long run, or reworking it to make closer to what was originally envisioned for it, and they did not like that either....