I could do this, albeit not an actual van. I don't like the idea of the transforming furniture, and your bed becoming your sitting area, becoming your kitchen etc.
Instead, I would love to have a little Tiny House on wheels, basically a very small timber framed structure (so properly insulated for winter), on a chassis.
You can customise them, so you can have a proper kitchen with full sized appliances, and an actual bed in a sleeping loft. Plus I would like a small wood-burning stove in the corner for those cozy winter nights.
You can have mobile internet, so you could watch tv/movies on your laptop.
I have seen loads of videos on youtube of people in NZ and Canada living in them full time - some elderly people downsizing, some with young families. So it's not all young single people.
I like the fact that I could be more self sufficient - solar panels could provide energy for a few months of the year, gas powered shower and oven. You could collect rain water. I would happily live like that for a few years, maybe longer.
I have lived alone in tiny studio apartments and I got on fine, I often thought if they were better designed and I had a garden I would have been happy there longterm. I don't need much space really. Not everybody wants the big house with the big mortgage and the 2.4 children.
A good friend of mind lived in a caravan for 2 years while her and her partner were building their house, she said the only bad part was during the winter because it wasn't insulated. I used their composting toilet a few times, it was fine!