The 905 cities' identities will survive fine whether or not residents of particular areas think of themselves living in the Village of Clarkson, or in Port Credit, or Streetsville, or wherever. All of those people also know they live in Mississauga. How is any of that different from someone identifying their home as being in Bloor West Village, or in The Kingsway or Leaside? You don;t seem to be worried about Toronto's identity suffering from that.
The only thing that was going through the Queen's Printers heads was 'are the plates in alignment?' and 'is the ink consistent across the page?' The cartographers and muckety-mucks at the Ministry of Transportation though? That's another story: Ontario's official road map evidences quite a number of strange decisions across its faces. To go on longer about that would highjack this thread.
In the end there's nothing wrong with someone or some group (nostalgically or belatedly) referring to Lakeshore as Highway 2, Hurontario as Highway 10, or that part of Mississauga as the Village of Clarkson. The important thing is that they communicate something that is understood by their intended audience. It has nothing to do with your imagined "This-city-is-a-rural-township-in-disguise" 905speak, as if everyone must be letter-of-the-law precise or risk looking like a hick.
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