I think we need to address the gig economy as a whole. It’s not good for anyone other than the companies who are exploiting these workers.
Beyond that, for Canada Post specifically, I don’t understand why I need lettermail delivered 5x per week. Cut it back to twice per week, and suddenly one worker can deliver to 2.5x as many houses per week. Or even just give them a day off and “only” double the number of houses served in 4 days.