I actually spent a majority of the last ten years on simple CRUD cases.
I mean think about it, creating a single row is CRUD, retrieving a row by ID is crud. Retrieving all the rows that belong to a user with pagination is crud, updating a specific row by ID is CRUD, deleting a specific row by ID is CRUD.
You have a settings page? CRUD
User profile? CRUD
Application form with more than 120 input fields, complex tables, split across multiple pages? CRUD
Heck I have a version of that where you get to nest multiple sub application forms into a single application with absurd amounts of nesting and it is still CRUD.
Most cases that aren't CRUD tend to be niche cases.
I mean think about it. An extended search feature that has hundreds of options is still CRUD and tends to work much better with an ORM since the query builder dynamically builds the SQL query for you instead of messing around with a static SQL query with a massive amount of feature flags.
The cases where you don't have CRUD are the rare cases. Things like reporting, batch jobs that process multiple rows at once or reconciliation that tries to find the differences between two databases.
Maybe it's not clear, but the arbitrarily complex application logic obviously is not written in SQL so even if the application is more complex than a straw man CRUD example doesn't mean that the database sees something more complicated than row creation, retrieval, updating and deletion.