Honestly I think they don't want to do it anymore because of the backlash it got (Specifically BRD) and we already have casting in casters and healers, so no need. I'd agree with a cast but if they make it a single skill that you use at certain times (Holy Spirit, Iai) like MCH lining up a Bazooka shot that takes about 4 seconds to cast and does massive damage. Then a cast time would be justified and pretty cool to use.