Sadly the most unused/“unbalanced” classes, aside maybe lacking better SFR, they lack usability for the most part. So, increasing SFR all around will not fix them, all classes will still remain as they are now: some of them being more useful than others, but now on a higher DPS.
I know I talk too much about Sadhu in this forum, but using this particular class as an example, it doesn’t lack damage right now, neither a good buff skill. It falls behind on how to properly use the class. The same applies to Monk, Miko, Diev and Hunter, for example - the way they play is clunky and hard to fit alongside other classes, sometimes working only on very specific scenarios.
Not gonna even start on PvP… cause for me it looks like the main reason the multipliers are going up is because they 1) changed the damage formula for PvP, reducing it a lot 2) Creeping Death Charm + Pass