With even rangers now getting expanded crits, would boosting mob fortification be a means to challenge players in high end content? (I do not have the issue of challenge but it is often discussed here on the forums.) This could be a solution instead of nerfing holy sword and other crit boosters.
Already there are numerous tools to overcome fortification, from enhancements to feats to gear/destiny abilities, so I am not sure how this might be done.
If implemented well, it would bring back the benefits of coordinating destruction/improved destruction and other tactical party efforts for bypassing fort, especially on bosses.