When is the last time you looked at the OSI approved license list? Of the most common licenses the EPL and CDDL licenses are incompatible with GPL (I suspect it's similar for the AGPL since it's a modified GPL license). When you look through the full list you will see a lot more. Basically read https://www.gnu.org/licenses/license-list.en.html#GPLIncompa... and see all the free software licenses that are incompatible with the GPL. Most of those are OSI approved.
Well, sure, but 10th- and 16th-most common (1% and <1%, respectively) isn't actually very common at all[0]. 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[1]).
Which non-copyleft OSI-approved license are you having difficulty combing with AGPL?