The story is usually that businesses don't want to commit to indefinitely expending their limited efforts maintaining software which isn't part of the company's core competencies. Most of the cost and effort of software happens after the first release is delivered.

> Enterprises have a business to run and don’t want to run a software shop on top of everything else.

It sounds like you mostly understand here. The biggest part of "running a software shop" they want to avoid is responsibility for support, bugs, fires, ongoing maintenance, and legal issues, of post-release software.

Dave's Pizza around the corner doesn't make a social media app, not because Dave can't figure it out, not because he can't vibe code one, not because he can't contract someone to do it, but because running a social media site isn't a core competency of Dave's Pizza. Instead, Dave uses existing social media sites, and focuses his efforts and passions on making pizza.

I don't think it's much cheaper. Writing some code to do some CRUD has always been easy. Getting to a proof of concept is definitely quicker. But creating something that can be relied upon in production? That's as difficult and time consuming as it has ever been.