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It would create problems, because different markets around the world would mean different Mks.
Take the Toyota Supra. In North America, the current one is considered the Mk V, because their first one was the A40 Celica Supra, back in the late 1970s. In Europe, however, the current Supra would be the Mk IV, because their first one was the A60 Celica Supra in 1982.
What about Japan ? With the A40 and A60 sold locally as Celica XX, is the new Supra considered a Mk III there ?
That does explain it well... Especially with the Supra example, Wikipedia factors the US models in counting generations but some sites don't, calling the JZA80 the 2nd gen
