Some might call them "API routes".
Use cases:
- Combobox suggestions in a form.
- This is not semantically navigation
- Single action buttons that don't quite feel like navigation
- like clicking a bunch of delete buttons really fast in a list
There are two primary approaches to page transitions (ignoring suspense's ditched attempt at a third)
Right now Remix has picked #1, but with a new export to a route module, we could support both.
Today, if you have this, Remix will wait for all data to load before displaying the page