Interesting point about the split.
One way to understand what kind of people these communities attract is to consider "what's in it for them". Most people who are focused only on understanding sexual/romantic dynamics well enough to get a girlfriend they're happy about being with will dip their feet into the community for a few months or a couple years and then disappear. It's the perpetual failures, and more importantly the people with a political agenda, who stay.
Roosh wrote Bang in 2007! That's a long time ago. He's in his 30s now and openly says that he's not interested in closing with a high number of women per year anymore. I don't know what your opinion is, but my impression is that Roosh's early work was pretty solid in terms of the basic mechanics of going from the approach to the close (though nothing past that, like LTRs). But nowadays his agenda is political, and I assume you're saying that PUA (e.g. r/seduction) is apolitical and practical, whereas the manosphere (e.g., RooshV Forum, r/TheRedPill) is political and focused on macro trends.
Kind of unfortunate I guess. Almost everything in the "manosphere" comes directly from the original Roissy of 2007-2009 (e.g., this post). Even The Misandry Bubble is just Roissy Macro written with more academic patience and less penetrating intelligence. While Roissy's practical system was also quite good, most people in the manosphere have given up talking about micro dynamics with any sort of insight. It gets pretty shaky with charlatens like Rollo Tomassi, who seem in it only for the political agenda (and consequently have their head in the clouds).
The reason I say it's unfortunate is because they've really made no progress since Roissy and a few other people (e.g., Ricky Raw here) laid the macro groundwork all those years ago. They're just getting louder and more active politically. Too bad the real Roissy didn't have the discipline and desire to use his intellectual power for something more rigorous. And nobody has stepped up to take his place. All we have now is the lightweights who talk practical and the counterfeit heavyweights who like to make a scene in the public sphere.
and more importantly the people with a political agenda, who stay.
Well, the political agenda is also a natural evolution. After getting laid enough times, it gets dull. Also if one is at all philosophically inclined, one notices that the very existence and need for PUA is a symptom of how dysfunction certain aspects of society are. Thus one is naturally led to politics.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.