I agree, on the condition that the person with the SPL doesn't use it to compete. SPL, in my opinion, unless you're showing it off at a comp, is kind of a waste.
I used to be into SPL big time. Now, I am starting to play around with the idea of building an SQ or SQL system. I am fed up with just a hell of a lot of bass. I am seeking something better. Sound Quality. My new SQ system in the car i am going to get is still gonna have plenty of low end though. ( I would like to run Focal or possibly eclipse in my next vehicle)