Well, they -did- buff the status song (it's actually a resist buff and NOT just recovery speed up, which had always made it lamer than casting refresh) and added the TP heal one-turn octet (In a game where amritas take forever to become available and the bosses actually tend to run everyone out of tp), but princess already has prevent order and a TP-healing force break... (If you really want to spam highest-cost skills though, like a compression alch facemelting things, the troub's is practically required tho; but... that's mostly the only case where princess doesn't do the job) Prevent order has to be spammed and you can't always be force boosted, though. But it's 100% effect pays you for the effort...
Max HP buffs seem to go pretty underrated too, as far as I can tell. It's like having another stack of the defense buff, and in this game buffs decay when you stack them, so you can't get that any other way. (2nd is 60%, 3rd is 20%, it doesn't differentiate between buffs/debuffs so troub atk song and hexer def debuff will make one decay) So, the troub increases party survivability by a notable amount more than another class can. Princess doesn't have Rally Order in this game either.
The one-turn heal octet isn't as lame as it may sound imo, and if you use a Beast it's almost the only healing skill that will interrupt between attacks to heal instead of triggering after every hit has resolved, which is a good thing. (You really need to doublemax it to get a strong heal, but it's pretty easy to find max level grimoires for lv5 skills, lv5 max being another reason it's nice) But, then again, Princesses heal a good chunk just from buffing people, plus they actually have Protect Order still >.>;
And then with the force boost, troub gets notably more turns to use not-buffing than the princess does, so more time to use octets or grimoire'd skills, which matters since you can actually easily get a variety of grimoires now. But... Princess has a powerful chaser attack for it's free turns even without grimoires ;_;
idk I'm just endlessly ranting