[mildtrepidation]

I don't know about "overwhelming majority," but yes, there is a very large slice of software that is essentially CRUD.

In my recent experience, though, it's almost always attached to, part of, or feeding into or off of something else, whether that's a CMS, API's, satellite sites, or some sort of proprietary custom plumbing.

Many things can be done by novices, and the limited supply of experts means they can't do everything. But for many projects, that boring stuff at the bottom handles the data that's vital to everything else, and it's vital to be careful when using novices to work on the lifeblood of your business. Without careful management, you'd better hope they randomly fail to introduce any serious design flaws or security issues given only "basic knowledge data structures, connecting to a database, and some UI."