I think that if you characters are at a high level trance is not necessary for example if you steal enough items with Zidane his Thievery(or whatever it´s called) can already deal 9999 just like Grand Lethal.

As for Steiner his powerfull atacks like Shock already do 9999 with or withought trance.Same goes for Freya.

So yes trance is not needed at all at least i rarely need to use it to win a battle.

Plus i miss the destructive limit breaks that the characters from FFVII and FFVIII could use.