Canada's a big country :-) As far as I understand, local transit authorities in every city have the autonomy to decide how they spend their budgets. A digital sign is useful, but is it worth having one at every single stop, considering the cost to buy them, the necessary infrastructure (electricity, internet access), the support costs to repair/replace them, etc.?

Also, paper schedules have been part of all stops here for a long time. Considering that the buses are pretty reliable, the paper schedule typically does the job. And you can always use the transit authority's website or one of the many mobile apps to see if there's an unexpected delay.