@Yoper:
I will tell you that during the playtesting we never even questioned the existence of the separate Canadian roundels. I would say that we were too busy with other, more pressing issues, but also it just never occurred to us.
Well, you don’t need any testing to know that a simbol that has no use in game must be deleted or must receive an use. It’s like in AA50 japanese roundels on Kiangsu and Manchuria: their only use in game is confuse players (in fact, I have a dude in my FTF group that continues annoying us saying that those territories are original japanese, go figure) and they should have been removed (well, i think that removing the chinese roundel on Manchuria and keeping the jap one was more historical, and also removing ridiculous ACME walls). Canadian roundels will only serve to confuse some stubborn UK players that will think that they can continue buying stuff at Canada after London’s fall (that in fact is much more logical than current rules)
It was not so difficult deleting the canadian roundels or making a more logical split Canada/UK. A interesting point: check AAP40 game manual, there is a picture of gameboard where Canada is only one territory and has a more logical UK simbol
The most probable truth: canadian roundels are there just because someone forgot deleting them. I might be wrong, but the explanation given to us seems a cheap excuse