To be honest, relic weapons in ffxiv right now sucks hard and involve zero shows of your player's skill, it's all about endless grinds on atmas, gils and dungeons spam... infact, even the best reward availlable isn't even BIS when a next coil/raid strike around the corner.

This isn't powerful legendary weapons, this is a just a side-quest goal you can work on in a casual way to get a decent weapon.

FFXIV have yet to introduce legendary weapons that give real advantages like in past final fantasys games, something like job additional effects, hidden effects and whatever that make a legendary weapon forever-bis no matter the patch/update/expansion.