I completely agree with your first point, but I do think that the majority of people using git probably don't have more than a single remote. I am sure there are those few people that are tasked with pulling (and hopefully, pushing) to the upstream, and likely a deployment remote like Heroku probably exists behind some process or script.
I do think that the majority of people using git probably don't have more than a single remote
Strong disagree. Nowadays the majority of git-users probably interacts with github.
Just count the number of "Fork me on github"-ribbons that you come across on any given day.
The github workflow for forking a repository[1] involves two remotes (origin and upstream).
