I don't think I'm claiming that the open tractor HAS to have a cabin. It should be an option, though. Possibly one with some positive peer pressure around it.

A box doesn't fix everything. You still have to get air into it from somewhere and it's all gonna come from outside. But sitting in a dust cloud is a little different situation than getting some dust through a vent. Especially if you're sweating like a pig the whole time.