Wah, planning to drive across Asia/Europe like that Jeremy guy?I never thought much about this... but is legislation the reason why we have landcruisers in Singapore with the pesky unremovable 3rd row? When I was shopping for an SUV, I was actually looking for something large without the 3rd row - or even a removable 2nd row so I could use it to move bulky things.
Yes, it's mainly due to legislation.
When the cars are registered, the number of seats are recorded. Car dealers can make the some seats foldable/stowable, but they want to avoid any potential hassles with removable seats when the authorities raise questions.
There's some safety concerns as well. I suspect they do not trust every single car owner to re-attach removable seats properly. In a crash, if the seats fly off and passengers gets hurt, sure will have a lot of paperwork, investigations, lawsuits etc.
I think VW managed to get their Buzz's removable 3rd row seats homologated by LTA somehow.
So which car did you end up buying that met your requirements?