If you are running a SaaS, how is system administration less important than coding?
Now if the author had written "software that allows you to be more productive on both fronts", fine. But the notion that operations is somehow less important than development is exactly what fucks up so many SaaS companies in the long run.
Your users want your service to be 24/7 available and responsive. That's not a static goal (unless you fail to gain traction), and an essential and highly integrated part of what you deliver.
Maybe the author is lucky that his particular SaaS is easy to deploy and scale, but dismissing system administration as a distraction that can be solved with software is not universally applicably advice.