Only made it a minute in.
I have a strong aversion to people trying to sell me some guru shtick, and the music, production and voiceover all have that flavor.
As far as 'philosophy of van life' I think that is going to be hard to pin down.
There are at least 3 different kinds of van lifers.
You have the people who see a few inspiring youtube vids and want to be digital nomads or do yoga on a cliff or something.
Then you have people who have been pushed out of the rental market in their area, so they are making ends meet by living in a vehicle while working full time and showering at a gym.
Then there is the whole cult of overlanders with their overequipped 4x4 vans and massive budgets. They don't seem to be living full time in their vans, it's really the same thing as your grandpa's Winnebago, but updated for the 21st century.
I'm sure there are others if I put my mind to it, I'm just trying to make the point that the people who are sleeping in vans are coming from distinct almost opposite directions in their reasons.
Survival, recreation, trendiness etc.
My personal reasons are many. But when it comes to van-lifing I have a few operating principles.
First I don't leave trash behind.
Whether I'm at a campground, suburb or urban neighborhood. I always make sure all my food waste, broken down cardboard boxes and yes even pee bottles end up in dumpsters. I try to avoid using residential waste bins. Some people get bent out of shape if garbage shows up in their trash can. Maybe pickup is every other week due to a rash of holidays? I know I have been in that position myself.
I also go out of my way not to call attention to myself. The other day a middle aged kind of biker looking couple was walking down the sidewalk opposite of me when I was returning to my van from the UPS store.
(great place to have a PO Box! You can get Amazon, FedEx and UPS stuff delivered. You can even get stuff that USPS won't allow like Lithium batteries and oversize things like solar panels.)
Anyway the guy says, hey is that your rig? Nice van!
I was going to hang out for a while at that spot, being next to a creek and a trail, but I got in and moved 4 blocks away.
Do not want to be noticed! Once you are noticed, the next step is over familiarity, which easily leads to some NIMBY person calling the cops or worse, private security.
Beyond such self preservation and hassle avoidance tactics, I think there are some fellow traveler kind of things.
Changing lanes on the freeway when someone is broken down on the shoulder.
Offering assistance if I see someone in an RV or campervan broken down.
At campgrounds I try to help older couples nearby if they are struggling.
I also try not to monopolize things like washer dryers, dish sinks etc.
A Buddhist would say that compassion for other sentient beings motivates them to acts of kindness.
A Christian would say do unto others as you would have them do unto you.