Yes, for one simple reason - control.
Music services, social networks, and other platforms will come and go. They’ll make changes that benefit them and hurt you. They’ll prioritize their brand and style over yours. They won’t give you access to information about the fans you aquire. Relying on them for everything just isn’t sustainable.
On the other hand, having your own website gives you a permanent home base. It’ll look like you, sound like you, and be about you. You’ll look more professional, and fans will find you and all of your releases easier from search engines. You’ll have full access to contact information and valuable insights about your audience.
Historically, the downside of having your own website was having to maintain it. Artists already have their hands full, and don’t need one more thing to manage. That’s where we come in.