That would be completely unacceptable to me since at home I use Netscape on Linux. If vroom took a step like you suggest and problems cropped up I would publically announce my reasons for leaving and if that didn't solve it I would. Certainly the stylesheets at a few home nodes has led to my avoiding certain people's home nodes. But the fact that the problem is localized has made it (almost) acceptable so far.
So I really, really don't want vroom to allow people to use their own stylesheets everywhere.