We already have different bars between normal char and SP card, I think we can all agree that it's very annoying that you can't organize skills in different SP, specially with the new class Martial Artist, for example SP1 has too many skills and only half of them are usable until you change form, you can organize this with two tabs but then the skill bar of other SP are completely uncomfortable.
I believe it's a bit more info to save into the database, so it'd make sense to have a different skill bar for SP TYPE, i.e. if you have two monk SP they use the same saved skill bar.
Using one bar for all SPs was good until martial artist and their different forms/skill set came into the game, makes it impossible to properly organize the bar.