Sorry I don't understand why you're focusing on xf 2 which is still in beta and far far on most people's radar vs supporting your existing customers on the official XF.
I'm probably going to be one of the first to migrate to xf 2 but realistically that won't happen until I see some feature parity with several key addons that I use.
I know you have to juggle resources but addressing usability concerns that would also impact xf 2 to me ranks higher than supporting a platform that most customers won't be on for a few months.
We are supporting existing customers on XenForo and a lot of them have told us that they're already ready to migrate on XF 2.0 and are waiting for ForumApps to be available in beta atleast, so they can upgrade as soon as it's out.
The other feature, login-less access is also something that 3 customers are waiting for. 2 of them have already been testing internally and haven't released their apps until this feature is out because it is crucial for their forums.
That is why these are a priority for us right now. We have very limited resources and that is why we onboard users in limited number.