My Prusa MK4 kit just arrived and I'm looking forward to seeing how assembly differs from the MK3s. I'm not going to have a chance to work on it until Friday though.
A few years ago they started to wrap them in black plastic to slow thefts. And they found it lead to them getting mistreated by shipping companies a lot more - and fewer working printers were ultimately making it to people.
I've seen speculation in the 3d printer community that when people see a foreign origin package that just squeaked under the import duty cost and wrapped in black they assume it's something for some rich jerk and may treat the package accordingly. But when they see it's a tool frequently used for regular folks to set up a side hustle, they're nicer to it.