I do take your point, there are many great shots produced ONLY with natural light and many with just hotshoe flashes, used to enhance the natural light - and of course using studio lighting with the right light shaping tools is no guarantee of quality.
But there are a large number of people who just don't understand light (natural or artificial) and who seem to think that good lighting is just about quantity, not quality and although some of them may find customers for their work, the more discerning customers will find photographers who do appreciate the value of controlling the light.
This isn't a criticsm of you, I'm just trying to point out that it can be much better to use the right tools for the job and produce outstanding shots, rather than easy shots.