Disagree. At least a minimum level of documentation should be required. And, yes… there are different levels of understanding, even in Blueprints. If what you suggest is true, why do we have so many tutorials on Blueprints if they are “self explanatory”? Also, the BP API’s are not complete, some nodes have very little documentation, so what you suggest about Unreal documentation is not true. Have you reviewed the BP docs? Sorry, but a ton are empty with very little of the “why” and the “how”.
Requesting completed documentation from both Epic and the content provider is reasonable and only helps the community as a whole.