Or freedom to combine with software using any other non-copyleft, open source license.
Which non-copyleft OSI-approved license are you having difficulty combing with AGPL?
Well, sure, but 10th- and 16th-most common (1% and <1%, respectively) isn't actually very common at all. Which applies to the AGPL as well.
The potential for conflict between EPL and AGPL, or CDDL and AGPL, code in projects is tiny.
For that matter, the GPL was around first, and is the 2nd most popular license. Shouldn't the EPL and CDDL have been modified to be GPL compatible (the Apache Software Foundation managed to work this out with the FSF, over the Apache v2.0 and GPL v3.0 licenses, after all).