Honestly burst window or no I would prefer with the charge system that only actions that don’t cause damage or have actual utility should have charges

Thin air/gap closers - yes have charges
Phlegma/assize/mudras/cards - no don’t have charges

CD’s of skills should be changed to reflect that and decouple so many skills from the burst window. You should be doing more than 1-2-3 outside the burst window

The best example I can currently think of for why the alternative is preferable is RDM’s 2oGCD’s on the damage side and emergency tactics on the healing side. They are relatively rigid, RDM’s 2 oGCD’s have a large part in organising the flow of RDM’s rotation and as for emergency tactics it has such a low CD as to be up basically whenever you actually need it but you can’t store charges to make it more powerful than it needs to be