I think the reason everyone jumped ship from XML to JSON was that JSON is comparatively very dumb - and dumb is quick to grok.
Then some of us realised JSON is actually too dumb for many things, and instead of going back to XML we made JSON Schema, OpenAPI, etc.
Others of us thought that the main problem with JSON is that it's not human readable and writeable enough. So we came up with new formats like YAML. [EDIT: My timing is wrong here, sorry.] Unfortunately being human we could not resist making it much more complicated again, thus increasing cognitive load.
There have been many times when in order to really understand a YAML file (full of anchors and aliases, etc) I've had to turn it into JSON. This is ridiculous.
Then some of us realised JSON is actually too dumb for many things, and instead of going back to XML we made JSON Schema, OpenAPI, etc.
Others of us thought that the main problem with JSON is that it's not human readable and writeable enough. So we came up with new formats like YAML. [EDIT: My timing is wrong here, sorry.] Unfortunately being human we could not resist making it much more complicated again, thus increasing cognitive load.
There have been many times when in order to really understand a YAML file (full of anchors and aliases, etc) I've had to turn it into JSON. This is ridiculous.