Roll on all that Darklight gear nobody wants.
You can trade it for 806 seals each piece.

Every of the 3 new dungeons loots 2-4 pieces of Darklight, roll on it, the others never take it.
Look, today in 2h of dungeon farm I sold 9 Darklight pieces.

That's 9x 806 = 7254 seals in like 2 hours, sure lvl40-49 FATEs give 270/280? And it might be faster but c'mon who likes to farm those?

In the dungeons you get Solidary/Mythology/Craft mats/The new good looking greens and ofc Darklights.

It's a win win choice in my opinion.