Why on earth would number of languages have anything to do with it. That doesn’t make sense. Parochial number of languages doesn’t capture the idea of understanding multiple paradigms, low level / high level, type system considerations.
A person might have zero experience except Node.js yet still show high mastery of functional programming, mixed OOP, design patterns, compilers, etc.
Setting any threshold on languages just sets up a meaningless metric.
I suppose this list could be called necessary but not sufficient. The question is what does a master “look like”. If you can only work with one or two languages you are by no means a master.
A person might have zero experience except Node.js yet still show high mastery of functional programming, mixed OOP, design patterns, compilers, etc.
Setting any threshold on languages just sets up a meaningless metric.