It's all the inverse of vlogging norms, because most of the time, if he didn't put out a video and instead put out a photo with his girlfriend, many fans would be angry. Yet many of his newer fans are there for content with Dianne, with a photo featuring her more precious to them than a video of Joe without her.
I did see some fans talking about how he didn't really take many photos at the show, so maybe it was meant to be a night where he kept his head down. Which would support the idea that he's just tired of the whole grind and wants more private time. That's understandable but he's built his brand on being accessible - it won't take long before gentle joking around from fans becomes anger and finally rejection.
He never really makes a big production of his grand office the way Zoe does so I wonder if he is spending more and more time focused there without letting fans know so one day he can finally end the channels and make enough money outside of vlogging. I usually assume these 'management companies' are just shell games or ways to move money around or whatever, but it does seem like he and Caspar take the business seriously.