It's time to redesign Level Sync

[EusisLandale]

Don't see the issue though?

Level 20 Dungeon as an example.

Level 20 Lancer, new to the game.
Level 70 Dragoon, veteran of the game

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.