[Adaptation does not drop in Arbitration]

I think I've farmed around 60ish Vitus Essences and I've had 2 drop, so yes, it's there.

**Edit** The second one I know for a fact was on a rotation A because it shocked the heck out of me.

[Why is there so much negativity about the game?]

OP, don't let it ruin your WF experience.  Sure there are some rough posts from time to time but it's a game forum, pretty much the same everywhere else.  I've been a gamer for probably around 30 years, I see things come and go.

Warframe as a whole is a great game and I've been hooked for almost 1700 hours so far, the community as a whole is one of the better ones I've experienced too.  Take forums (and YouTube) for what it is, a place where people voice their opinion.  Way too many excellent points in the posts above to quote, but this whole thread hopefully helped you out.

This is my first post ever on these forums, I'm usually playing Warframe (and not posting on the forums) or at work (currently slacking off at the latter so took the time to provide my input LOL).