I don’t know how Canada is, but I could see it being even more confusing if mixing metric and imperial units (e.g. for US imports).
Oh, it can get frustrating. For example, potatoes by the bag are often listed as price per 100 g, while potatoes sold individually are price per lb or kg, if you are lucky.
A tray of baking potatoes is priced “per tray” and not per weight of the potatoes. “Small white potatoes” are listed in price per 100ml on the same website… LOL
And that’s all stuff listed on websites. Go into a store and you’re lucky to even have a unit price listed. Shopping has become either guesswork or based purely on experience.