The usable range where you have to get things right in the mix is essentially from about 50Hz-12kHz. Mixing and mastering. Everything else is just a gimmick IMHO. Especially the range from around 100-10000kHz is extremely important because that's what humans hear most prominently and these frequencies should use like 99.9% of the headroom.
IVGI has a really nice and noticeable LPF... and nobody seems to mind. I love it, too. Everything just sounds warmer and nicer with it. So you can concentrate on getting the mids right. And when you boost that 8k or 12k a little, nobody will notice the lack of 15k. Really.

