Disclaimer: I'm not defending myself, I don't DJ professionally, I do have a bunch of DJ friends, I'm an engineer and I probably understand the underlying technology better than most "DJ's".
I try not to get dragged into these debates, but I'll wtf, this should be fun. I'm going to try and focus on the meta arguments since getting dragged down into the specific details is mind numbingly boring. Technology will march on, improving your own understanding is what is going to keep you dominant in your field, not trying to shame people into staying stagnant.
Go read Kurt Vonnegut's Player Piano: Technology marches on. It won't stop, and part of the forward march of technology is that it sometimes makes whole professions and whole areas of research obsolete. Thousands of assembly line workers have lost their job to robots that largely build cars on their own. No programmer starts a project in FORTRAN because higher level languages like Ruby and Python have been created. Kodak, once the largest supplier of film is in bankrupsy. Someone somewhere is writing algorithms to use an Xbox Kinect to read a crowd and totally replace the DJ.
In the modern world of technology you need to adapt and learn new things in order to maintain your relevance. We get it, you spent hundreds of hours learning to beatmatch and invested thousands of dollars in vinyl records. DJing is not unique in it's position of being run over by technology. I spent hundreds of hours learning the nuances of fortran in college only to spend hundreds of more hours learning Ruby when that became the hot new programing language. I spent thousands of dollars on film cameras and lenses only to have to replace them all when digital came around. In most technological fields you are going to have to learn new things continuously and invest in new technology to stay relevant. This is the rule, not the exception. Notice this doesn't mean that you can't do things the retro way for the sake of art, but you are going to be Retro.
Technology builds on itself. It starts with low level building blocks (electrons, materials, notes, photons) and works it's way up to high level concepts (websites, cars, dj sets and photographs). The whole of each of these stacks is so ridiculously complex that there is no hope that anyone is going to master the whole stack. You don't need take classes algorathms to write code to build a website. You don't need to understand material latices structures to design parts for a car. You don't need to understand photon's or refraction to take a picture. You don't need to have a degree in sound engineering to DJ a stadium concert with 100,000 watt sound system. And now due to the very nature of technology you don't need to know how to beatmatch to be a DJ (Although sooner or later you are going to have to mix into someone's vinal only set).
This isn't to say that understanding the lower levels of a technology doesn't help. Actually the better your understanding of it building blocks the better you will be at your level of the stack. Understanding algorithms makes you a much better programmer, making a pin hole camera and understanding refraction will make you a better photographer, knowing how to beatmatch will make you a better DJ or producer.
Art can be whatever the fuck you want it to be. It can be simple and easy like splattering paint on a canvas or taking a photograph. There are entire websites dedicated to "Accidental Art". In a lot of these cases the artistic value of this simple art comes from all the underlying knowledge that theses artists have about composition.
Art can also be incredibly complex (and impressive) at any level of a technology stack. It can be a drawing with a pencil that looks like a photograph. It can be rebuilding a classic car. It can be a photograph taken with an old film camera or It can be a 7 exposure HDR picture. It can be beat matching with vinyl or it can be beat juggling on four decks with tracktor. Take a look at some of the advanced stuff people are doing on DJTechTools and tell me it isn't impressive. It can even be an entire prerecorded production (like a movie or one of Daft Punks sets). To your point about an automated paint bursh... I'd be fully impressed with anyone who could create such a machine. Excluding art at any level in a technology stack is stagnant and naive. Your idea of shaming people into limiting them selves has only limited my view on how I think of you as a producer and DJ.