Yes, businesses tend to believe that.

No, every time people switch knowledge gets lost and code quality degrades.

In part I blame accounting rules justifying investments is easier than maintenance.

Interesting take. We are not going to talk about Office, Windows, Adobe or Autodesk products here. Neither Linux kernel.

Just classified ads or e-commerce platforms such as gumroad and shopify are complex enough that a single person cannot master them end to end. The domain is huge to master and takes a lots of time to master.