I did several months adventuring in my car some years back. I found it to be fine.
When I consider the advantages of a van, all of them seem like drawbacks as well. Sure, you can have a cooking setup, but that takes time to clean and deal with. It's a lot easier to just not cook. Bathroom? I mean, I'm happy to go in the woods or at a store. Shower? Yeah, much easier to just go to the gym or hop in a river. AC? Most vans seem to just have like a fan or whatever, a hybrid or EV vehicle will keep you far cooler.
Basically, I can kind of reason away every amenity. For full-time living over long periods of time, I definitely get it. But, for seasonal use and trips, I'm having trouble seeing the benefit over a lot of standard vehicles.