“RESTful” API design is mostly bike-shedding.

There’s no standard. Every REST API looks different. Clients have to refer to documentation anyway, so consistent URL patterns achieve nothing. People waste large amounts of time over totally inconsequential minutiae like whether to use singular or plural words in URLs.

Separating idempotent calls from non-idempotent calls is useful, but REST overcomplicates this. All that’s needed is read and write calls, yet REST has get, post, patch, put, delete…

REST is also inefficient. Clients could read the data they need in one HTTP request, but most “RESTful” APIs force clients to make many requests for the sake of what is essentially aesthetics.