You can be capable of Broadsides while still having an enormous Forward Mount that runs the length of the ship. For instance, I'm sure the Raynor's Main Gun up front takes up a good chunk of the ship, if the size of the Beam Cannon...firing shafts, I guess, in the pic above are anything to go by (and also assuming that Battutta's lack of contradiction as actual confirmation in that regard.) Giant Forward mounts don't necessarily indicate head on attack doctrine exclusively, its just a damn big forward facing gun (or set of said guns, in most cases in BP.)
That being said, yeah, you're right. It does seem like, with the smaller vessels at least, they are basically being divided up into two camps. Destroyers seem to remain capable of tackling anything no matter the situation, though. And UEF ships have the advantage of Torp Spam, so even direct Assault ships like the Narayana can engage targets from any angle, if not favorably. Thats more then the recent GTVA corvette generation can claim.
I was also being semi-facetious, truth be told.