Ast cards should stack.

[DarkMasamune]

point is with songs 4 example u might nit be able 2 stack foe buy you can stack 2 songs on top one another ast doesn't have that even if its a different card.

also most those things u listed outside songs does not effect how the jobs are played ninjas still got jutsu 2 spam for example.

im not saying balance should be stacjed with balance but it should be able 2 stack with arrow,bole,spear since its a different card

You can't really stack two songs. The crit buff is given to all the other party members but the one who's singing (the BRD). If another BRD is in the team and decides to play a song, it will, technically, only affect the BRD not affected by his own song.
So I don't think this applies here.

And if a BRD uses Troubadour on one song and another one decides to use it with a different song, it does not stack, it replaces the effect. Which is quite annoying to be honest.