There was a famous video of a Scout player who had destroyed an overwhelmingly powerful enemy army by shattering their morale and then surrounding them with his own troops to finish them off.
Additionally, the player could easily clear dungeons that were impossible for others due to job incompatibilities, raking in a fortune. Essentially, the Scout is an all-rounder that excels in everything but direct combat.
'Of course, being weak in direct confrontations means they're vulnerable in the early to mid-game if their position is revealed, but with allies to protect them, it's a different story.'
Most importantly, if there were dungeons like World Breaker, having a Scout was practically essential. While others might be left standing in front of treasures with no means to claim them, a Scout would ensure that their group could obtain massive rewards.