Style enforcement (or perceived enforcement, or soft enforcement, or whatever you call it) was always an issue, long before noun classes came to the forefront. Before that it was things like inserting pronouns where none were needed before, changing between title styles, and others. And when a high-rep user or several *prowl* the stack, methodically making changes, that most definitely looks as enforcement.
It also means that unless actively contested and stopped, the stack style *will* shift towards the prowler's, even if allegedly there is no universal style guide.