Yeah I suppose they are, for every 20h a decent amount of mats roll in and thats fine. Especially for ghast tears since I dont have the time to go do shrines.Don't you suppose that the reason the Nyx quests are more valuable than the grinding you can do permanently is the point?
Me and jakeman5 did a test with grinding pearls and without double drops the numbers were quite bad, I know there was a bug with DD which was fixed but the baseline amount without DD was quite small..
Maybe if this is how you’re going around the grinding issue, add Ender Pearls to Nyx rewards?