For the time being, we are disabling the Team Optimizer. (If it isn't disabled as of this post, it will be within a day or two.)
The Team Optimizer was a cool feature when it was originally created and implemented a couple expansions ago. But with the way loot has changed in Legion (titanforging system, legendaries, the crucible), the "gearing problem" has become both more complex and more "grey" (there isn't a fixed "best in slot" list anymore really).
This makes the current Team Optimizer design both less useful and much slower than it was originally. At this point, it really needs a complete overhaul. Not just a couple performance tweaks or minor UI features -- the whole thing needs to be redesigned from scratch to fit the new gear meta-game.
When will it be back?
We have no ETA right now -- there are several other features in the works (some more optimizer features, lots of work on Antorus, some new addon features, etc.) that we consider a higher priority. Most likely it will make a comeback for the next expansion.
What if this was the main reason I had a premium account?
If your main reason for having an AMR premium account is to use the Team Optimizer, contact us via our contact form: http://www.askmrrobot.com/contact
Please describe your situation to us, and we will happily issue full or partial refunds depending on your case.
We want feedback!
We don't have a specific set of features for the next version to share with you right now, but we definitely want the feedback of people who have been using it. Is there anything that you really liked about it? Anything that you would really like to see added into a new version of a similar feature? Now is the best time to give feedback, before we start working on the next version!