Originally Posted by
Akonyl
The whole Eden, SHB, CT headache is what informed the decision, they mentioned the decision in a liveletter/fanfest/interview or something afterwards (so, those decisions made at the start of SHB don't debunk it). Their reasoning was that there was a somewhat mixed reception to making CT mandatory, but that also they didn't want to feel limited in what plot threads they could pull, for fear of tacking on even more busywork to the MSQ (like "oh, we want to meaningfully tie in Eureka beyond a few throwaway lines... time to make everyone do Eureka for MSQ!"), and they didn't want side content to be necessarily doomed to side-content purgatory forever.
You don't have to believe me, but I aint gonna go through the effort of finding/dredging it up for a forum post, because "side content tie ins to MSQ yoship" doesn't have a lot of keywords to search well off of, so I doubt I'd be able to easily find it.