The main thing that concerns me about a fully cashless society is that the means of buying and selling stuff shifts fully into the hands of the for profit, private company payment processors.
Not necessarily true. The federal government can and should roll out their own instant payment mechanism under the supervision of the central bank or federal reserve. For reference: the FedNow initiative in the US, FPS in Hong Kong, and PIX in Brazil.
Interac is an aberration and it should be killed by a real public service.
Montreal is a lovely city, but it isn’t for everyone’s tastes.