I think of it this way:

Is your goal for the software you write to need constant intervention, or would you say you'd aim for it to run smoothly with few bugs?

The team is akin to a piece of software architecture, only much more complex and comprised (partially) of humans.

You want someone to build that team and then have the team up and running, delivering value. When it breaks, or you want it to do new/different things, you need someone to step in to fix it or change it.