What's the purpose of a map if not to reflect how people actually refer to and interact with these features? Disputed borders are handled that way because peopl

What's the purpose of a map if not to reflect how people actually refer to and interact with these features? Disputed borders are handled that way because people inside those countries have understandings of "their" borders (and it's politically convenient for the companies involved). The term "Lake America" isn't in active use as a geographic referrant, so there's no point reflecting it in a map beyond the political convenience.