offtopic, this is not i said and you know that. That started because you said that "and I doubt you frequently use all the skills you say you need.". Frequently or not, you do use lot of skills but the cooldown is also an factor, so if you press once Call of Greatness in an fight because the skill have 4 min, and you use 100 times the major ballad, that will make CoG an lousy skills because his frecvency was 1%? Each skill have an purpose and the fact that you are using once per day does not make him less important. You will use him exactly in the moment you will need him, no less, no more.
So no, your opinion and my opinion are the same as long as we are both enjoying this wonderful game and from our money we try to make the producers to make an better product. But if i prefere to squeeze every single drop from my minstrel, why not to be possible? And my friend, i am really using most of those skills hehe.
and secondly
on theory that work ok, right? You think what instance you will do and trait acordingly. Oh really, how so? Let think, when we will do one instance for first time what shall i pick? Let say i dont pick anthem of war. An dps toon DC in the middle of the fight. I will try to compensate his loss with anthem of war ... erm, i cannot use it since i am not traited. Oh boy the cappy suck tonight, i want more heals ... erm, i did not sloted third age. You just cannot say that you will know for sure what to pick at the start of the fight and you will need to compensate after one wipe but that will not make me happy. What do you think about this? We just cannot start an battle with 100% to use ONLY the skills you choosed. Why not having all of them and pick them acordingly?