Great point. Today I went to exchange my Michigan DL issued in June 2018 (2018-2022) and took with me previous expired Michigan DL ( 2014-2018) and even expired 1998 DL from a beautiful BC and expired 1999-2003 DL from Ohio.
No way, the officer said my current MI DL is less than 2 years old and previous MI DL is not valid (expired) and suggested in order to exchange to full G Ontario to get official letter from Lansing, MI stated the date when the first Michigan DL was issued ( in my case - in 2002) to prove at least 2 years of driving experience.
Make sense or not make sense - it's the Canada, all about regulations.