On this day a year ago, Plunge was taken from us (and other Job Identity)

[Valence]

Everything, unless that was sarcasm. Your movement tools being tied to a major function of the job is extremely limiting.

Pvp is all about choices. You can't have your cake and eat it, and it's a core thing in many job toolkits.
PLD has a dash that stuns: the player uses its brain to decide whether or not they need to dash outside of kill/burst opportunities, or if there is a target that needs being stunned right now, and the dash provides the gap closing to apply damage just after and it's the same for Plunge.
DNC generates its procs by dashing as well: dash too much and you'll overwrite things and lose firepower.