Why so obsessed with bass?


Such a obsession to deal with bass issues.  Why is this?  
On a sub if there is too much rumbling simply turn it down.  
As far as mains these probably are not much of an issue for most of us.  However for bookshelves speakers it makes sense they really aren’t well designed for lower range frequencies.
emergingsoul
Actually, I know some bookshelf speakers that make better bass than towers. Duke has a very valid point about using just one sub two good mains being better. Even companies like Magico and Wilson make subwoofers for their systems. It is however possible to design a main speaker with excellent bass but it would have to be very large and quite heavy. I do not think that you can get the very best bass this way but this is an opinion. Having built subwoofers for 30 years there are issues specific to subwoofer design that would be difficult to use in a main speaker design. It is easier to do it in a separate unit. In my case since I am so enamored by ESLs it is the only way I can go. I am about to start construction of MS Tool and Woodcraft's Model 4 subwoofer. I hope to have the first unit and proof of concept done by the new year.  
Why is bass so important? Why do us males like kicking a--. Why do we like powerful sports cars? Why did our ancestors bang drums, scream and paint themselves up before battle. Bass is important because it is.
It always brings a smile to people's faces. Once you have it everything else sounds anemic, a Mazda Miata vs a 911 Turbo S cab.
@mwatsme, quite right particularly about distortion. Add bigger drivers to that equation. I do not like the term fast. I do not think it applies. I prefer tight vs muddy. You want to be listening to the driver and nothing else. Unfortunately, enclosures are musical instruments. They make noise when excited by the driver. They also move. These two problems muddy the sound. Building a perfectly rigid, immovable enclosure is very difficult and for commercial interests very expensive. The Magico is a good example. There are contradictions that you have to work through such as,
it is easier to make a small enclosure stiff but you want an enclosure as heavy as possible so it does not move. You can't put big drivers in a small enclosure but bigger drivers have less distortion. Companies have to make compromises based mostly on cost. Even relatively expensive subs like JL Audio units have to make compromises. 
If set up right, a little bit of added bass will make the music more full and ambient. Try to add a sub at the center and closer to your listening position if possible.
I have heard that having a 2" thick piece of granite or bluestone cut to the size of your downward-firing subwoofer's footprint and then sitting the sub on top of it will improve bass, the idea being that there is more and denser mass to the stone than the wood floor underneath, with the added benefit that it will keep the entire house from becoming a transducer.

Does anybody have any thoughts about this? I am considering it.
Such a obsession to deal with bass issues.  Why is this?
The ability to control the extra low frequency is just plain fun for me.
  
On a sub if there is too much rumbling simply turn it down.
With proper room placement and modern multiple equalization parameters its possible to increase the extra low frequencies while controlling the subs unwanted nature.
 
As far as mains these probably are not much of an issue for most of us.
Probably not for many but being obsessed I enjoy that brief sense of conformation when I see a statement full range speaker being demonstrated with subwoofers.  

However for bookshelves speakers it makes sense they really aren’t well designed for lower range frequencies.
True, but with the right program material I've been startled by more affordable small two-way speakers than I can remember.
Watch out for that deep rabit hole.