Is the point of the system to give buffs new icons, or is the buff system as a whole being reworked? Most buffs that get applied to me on a regular basis can’t easily be “stacked” into a single icon. This is especially apparent in escalations. (Frost being the main offender)
Escalations are definitely a challenge, as the source of by far the most random icons that end up in the bar up there. This is on me, I made almost every Escalation amp in the game!
But where possible we are still converting them into the new system, otherwise, we're doing a lot more 'action -> reaction' based changes. So for example, there is currently a fairly unnecessary buff stack that shows up while you have Thunderous Mantle that builds up while sprinting, but this can be clearly shown by the appearance of the lightning VFX around the character to show you have reached enough sprint time to get the damage bonus.
A lot of this is about cleaning up that buff bar so that it only contains actually relevant information, and all of that information is immediately understandable.