Animus is way more boring than atma, because of the myth farm, but still, I find it's fine. This is how grind works, you have to do something boring to get good upgrades - and again, I won't accept narrow-minded answers like "it's just a skin" - and if it wasn't boring, it wouldn't be a grind.
I enjoy it because it's rewarding, you do something long and get something good, which is not just a skin, but a further step towards a big upgrade like animus and novus.
People who complain about the drop rates know absolutely nothing about RPGs and should either play some other videogames or stop playing them and be quiet, instead of asking for easy rewards.
Here is the difference between Coil and Relic:
Coil =
Skill - High
Time - Short
Relic =
Skill - Low
Time - Long

If the drop rate happened to be raised, zodiac quest would just become a low skill-short time-high reward quest, which is definitely bad.