Some of the reasons fascia and the fascial system is important are:

1. It holds your organs in their proper positions
2. Maintains upright stance
3. provides for a gel-like matrix so muscles and organs can slide past each other

Here is a partial quote from Ida P. Rolf, developer of Structural Integration:

. . . it can be like making your bed in the morning. You think you’re going to get by without pulling that bed apart, so you pull up this cover and the next cover. When you get all the covers puffed up, you’ve got nine ridges running across the bed. Now you’ve got to go to a deeper layer and organize the deeper layer, and make your bed on top of that. Then you’ve got a made bed. Well it’s the same with the body: you’ve got to organize those deeper layers. . .