As a current SRE, and having worked in a small startup, this doesn't echo my experience at all. What the author describes is possible what we would call "on duty" work, the grunt/maintenance work that comes with big software systems. It's not fun, and most companies/teams have friction getting this sort of work done. It's also however not how my SRE role is defined by any stretch. Our on-call work is much more about…
Support work is a necessary nuisance, but it's also not what on-call is meant to be.