I don't think the people who keep making threads like these really understand the amount of rebalancing that would be required for something like this when it simply isn't necessary.

Level 20 Lancer can raise their damage 15%. Can not do any aoe damage at all.
Level 20 (70) Dragoon can raise their damage 15%, can increase the target's piercing damage taken 5%, can periodically raise their damage a further 15%, has a dot, can raise the party's crit rate, can raise their damage yet another 10% while raising another player's damage up 5%, has multiple aoe attacks.
There is no reasonable way to make these players even remotely similar in dungeons.
Like, this person gets it.