Similar sort of thing in Europe. Chip & pin is already the standard, so from a retailer's perspective there's little incentive to add Apple Pay, especially with the costs of training people how to use it and buying the necessary equipment.
Not to say Apple Pay is bad.
No new equipment is needed. If the terminal supports NFC and don't go out of their way to block Apple Pay (MCX ties), then you just need a card issuer that supports apple pay.
I have Chase for example, which supports Apple Pay. I was in Toronto last month and used Apple Pay almost everywhere and didn't have a problem. Canadian banks (credit card issuers) don't currently support Apple Pay, but most of their terminals do (because they've been using chip and pin for a while). The tech/terminal support situation is actually way better there than it is in the U.S., and it should be the same elsewhere.
Australian banks just don't want to pay the fees for Apple Pay transactions on cards they issue.