Why would they make the change "to avoid confusion," if that wasn't the case? To assume something as simple as Firaga vs Fire III would be cause for confusion is to assume your customers' brains are leaking out of their ears.
I mean, I've seen what players are like in DF, so it's not far off, but to assume that it's only a problem for the English localization? It's dumb.

And when SE is generalizing the player base for FFXIV, it's a much, much broader audience than is going to be attracted to Theatrhythm. The LCD that will be catered to is different between the two.

I don't play BLM so it's whatever, as I said I just think the situation is funny.