Hauril, thank you for your excellent posts on RESTful APIs. They are well-written and technically accurate. However, they do not really convey the real power of the REST architectural style. That is not your fault and you are working hard to understand and describe RESTful APIs.

The basic problem that REST has is that it is being used as an RPC technology when it is far far more. I've tried to explain the real REST in the following post:

https://medium.com/nerd-for-tech/designing-a-rest-api-3a070398750f

I hope you find it useful.