All they have to do to fix castrum since its required my story is attach an EXP reward to it. Once they added coins to critical engagements, they effectively killed off the large scale content that is meant to progress the relic storyline...effectively locking out anyone who didn't do it during its original rush either because they didn't have the time or some other reason.

I completed castrum, but stopped at level 13. The critical engagements dont really give EXP that would be justified doing that without making it feel really grindy (or maybe that fixed that. I haven't done bozja since late Nov/early Dec)