I agree with both answers. I think that UML is one of many available options to document your stuff. The funny thing is that, like many other things, UML was s

I agree with both answers. I think that UML is one of many available options to document your stuff. The funny thing is that, like many other things, UML was specified in a way that is not practical to be followed 100% so people use it as they see fit and that's ok. The other important point is to take into account your stakeholders. Developers (myself included) are also stakeholders so in many situations I create documentation for my future-self since it's the best way to remember that was the context at the time or how that weird stuff that is ran once in a while is done.