It isn't our fault that they don't practice proactive communication or set up reasonable/manageable means for us to communicate and them to respond.
If I were one of two people working on a project (which has been the case plenty of times.. just not a video game) that was going to impact many end-users I would've at least done the following:
1. Provided complete change notes
2. Posted a message explaining the vision behind the changes.
3. Proactively started thread topics that covered the various types of changes so that "I" could easily/quickly go back and read them in a manner that worked for me. (i.e. one for each profession, NPE, Shops, Raid experiences, etc).
4. Proactively provided guidelines for submitting feedback.. in fact flat out provided a form that could be copy/pasted into a forum post so no relevant information is left out.
It isn't our fault that there are only 2 people (or however many) working on this project. In my opinion, such a small crew is the reason why it is even more important for them to streamline communication and make sure everything is clear.
Edit: There are also bug/feedback reporting web tools that they could've easily deployed for 18.7 feedback that basically would've done all that I described above in a very simple manner.
Mantis Bug Tracker is one that comes to mind as an example.