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So? If they are different types, it makes sense to have different extensions (e.g. if mts implies typescript module).

> mts implies typescript module

Or mpeg transport stream:

They usually use .ts extension, or .tsv, .tsa according to the wiki article you just linked.

.mts is unheard of.

Ive seen it in the wild. May not be that common though.

my camera (Lumix GH2) produces MTS files

Well, they can coordinate that like we coordinate mime types.

I've chanced upon the "same extension for the same thing" as a problem maybe 2-3 times in 30+ years.