Statement systems have great big front facing subs because they are statement systems. Music systems not trying to make a statement put the subs asymmetrically different distances from corners because they are more about the sound than the statement.
I would say it is like race cars have wings so guys put wings on their Camry because: race car. Except wings on race cars actually work. Stacks of front facing subs are there because they look good. Audiophile expect it. And it is way easier to give audiophiles what they expect than educate on what actually works.
Case in point, 20 years after DBA and still hardly anyone gets it.