It is also like using fancy vocabulary. You might sound smart and all but most of people will think you are silly. Then there will be a lot of people who won't understand you and there might be more problems because of that misunderstanding.
When you will make perfect REST API there will be someone who will not understand it and will just try things and he might make a big mess.
The same if you will create beautiful, perfect, UML diagrams. If no one else is proficient using them and it is only you. There is no advantage of working this way.
i don't think it is. the article isn't saying the diagramming is dead. it's saying uml is dead.
using boxes and arrows isn't uml (full uml) and as you say, it's wasting time to go "full uml," which is why it died. diagramming will live on, even if inspired by uml.
I think most of people were doing UML-ish diagrams anyway because unless you really have a use case for it it is just wasting time to go full "UML".