Don't let closing of threads or these types of threads scare you from getting a license,
Yes its a concern but look at it this way, IPB and VB have many employees, many developers and due to their size they have the opportunity to also post on the forums and communicate with members.
Notice the fact that support tickets are still being handled, that shows that the staff is not completely missing, they just aren't active around the forum, yes for some a roadmap would be preferred but I like surprises, I'd be happier to see something included in the next XF version that was never revealed before. But that's just me and I understand not everyone prefers that.
As a forum administrator you are the captain of the ship, a captain has the responsibility of all the crew on his head while you have the responsibility of your community and members on your head. Don't tell me that just the absence of staff presence on the xenforo community (notice, community) would raise a doubt in your mind regarding purchasing the software that in my opinion is the best out there.