Not yet 
There are a bunch of articles on the blog (listed in this post and this one), and a list of known issues at https://support.trainerroad.com/hc/en-us/articles/360059656131-Adaptive-Training-Known-Issues.
Yes, you need to keep testing. The TR team has an interval version of AT that does automatic FTP estimation based on performance, but it’s not part of the beta.