Music is consumed very differently these days compared to ten years ago.
Instead, let's agree that there are arguments for and against mastering your own material. Over the last few years, more and more plug-ins have emerged that promise great mastering capabilities making 'self-mastering' easier than ever before while also providing tools that help us to deliver music to a range of modern-day loudness specs. There's absolutely nothing wrong with that, this article isn't going to open that can of worms. These days many Music Producers and Recording Artists 'self-master' their music.