Thanks for the detailed explanation

However, if they do keep it so high to allow ogc skill to be used without clipping, that's slightly retarded. The number of skills OGCD vs IGCD makes you loose quite a bit of time overall.

If their concern is the animation thing, they could simply make that OGCD do not exist anymore. U just have different "recast time"
anything you want instant and "OGCD" would have 0.5 for instance.
That wouldn't mess up their coding since they can already do that.