About the romulans - their home planet is due to be pulverised in a few years. They'll need all the internal stability they can get to get through that.
About Sisko (and, without exception, all the other DS9 characters presented in the Typhon Pact books that had more than 2-3 lines) - their characterisation has been unsatisfactory; too abrupt, too rushed.
A while ago, on these forums it was discussed whether the 5 year jump for the DS9 Relaunch was a good ideea or not.
For me, the books so far settled the matter:
-the characters' development suffered, it's not organic, but eclectic, the characters seem all over the place; also, they have become too spread out;
-plot threads that were anticipated/developed extensively were dropped - ex, the Ascendants; it's obvious it was decided to abandon previously prepared plot-lines;
-at this point, if the DS9 Relaunch is to continue, it will have little in common - beyond the setting - with what came before.