
I have a theory that most photographers go through phases in their work. It could be that this involves changing what you want to shoot, switching between the best mirrorless cameras on the market to find a different camera system that suits your workflow better, or changing lenses, either type or focal length.
I've also been through these phases in my professional photography career, and while I've now switched from being a professional sports photographer to someone who's trying to find beauty in the mundane through street and documentary-style photography I've seen my gear change from multiple cameras and lenses to just one camera and one lens most of the time: a 50mm now being my focal length of choice.