Good point on Black Saint/Soul Note. Calig also put out some great sides with Marion Brown as well as some serious Euro-free shit, tho ceased relevance pretty quickly (if they ever had it).
I can't answer for Manfred Eicher's reasoning and would hope it's more aesthetic than otherwise biased. Dunno.
You're right, though: ECM sound could do a lot for somebody like Matt Shipp (if he were to avoid the trip-hop crap or whatever the fuck)... As for Braxton and Muhal - interesting idea. It's a drag that 90% of that material is on import-only labels that are a bitch to find in, say, a "store" somewhere other than NYC/CHI/SF.
The EP Electro-Acoustic shit is weak, and I wholeheartedly agree that the world doesn't need another EP record (nor another KJ record) in theory. But of course, people will continue to release records if so inclined, and there's obviously an audience. Better EP and KJ than a lot of other crap out there...
Brotzmann/Moholo/Miller def. needs a proper reissue; I love Brotz and concur on the Patchen bit. Mike Pearson's reading a bit more theatrical than KP's dustiness (for me) requires, but still very good.