The average pace of 2.5 s is great, although I want ATB bar to show it!

Instead of lowering the GCD, i feel it just could be a little varied depending on skill used. Just like some spells have different cast time.

Remember when in FFX some skills had different recovery time? Like if u used quick hit, item, weapon/armor change, cheer etc u had ur next turn sooner. But when u used haste, hastega, ultima, powerful overdrives etc it took long time for that character to get next turn.

The main profit on varied GCD, working like a "recovery time", would be another balance mechanism apart from resource cost, so u can have low GCD skills hitting for less damage, or long GCD skills hitting for lots of damage/additional effects.

It also enables adding "Attack" as a TP charging skills instead of current auto attack that does not fit at all combat revolving around using skill every 2.5s or less, fixing also TP starvation issue.