oh i think most people growing up heard ports tuned at high frequencies and they don't ever get to see the value of a belching extension.
instead, all of the ports are setup for the low bass extension where the box doesn't have any compression & it requires a smaller amount of power to get the speaker to move .. yet most people aren't using the equalizer to boost the frequency any , thus the possibility is there & nobody hears it or knows it.
go to a place like best buy and fire up the demo speakers in the ported box and they might as well go no lower than 40hz
the same thing stupid 2-way speakers can provide, except much louder.
then to make matters worse, they leave the low pass filter up high.. so the subwoofer doesn't sound like a sub woofer , it sounds like a woofer playing really loud.
then, with that inertia, their mentality makes the claim 'well they are advertising we can & should listen to it louder .. why not upgrade the door speakers and put in some amplifiers for them to make the whole thing louder?'
and i'm jst banging my head

thinking 'whole thing?!! you haven't heard bass extension or a flat frequency response yet'
then i could go on about phase mismatch and time delay adjustments needed too.
it's like the industry tries to get everybody to sleep with the most ugly mate with healthy reproductive organs as mentally and|or emotionally possible.
and for what? because it saves beauty?
there won't be any beauty left if it stops being born..!
duh
