Maybe JBrondos wonders why it's called "rooting". It's because rooting lets you tap into the root system account which administers all other accounts, as in "root of all evil", if you will, or perhaps more accurately the root of the tree representing all accounts.

All devices are rootable if someone puts their mind to it, and often easily (I've seen numerous articles where newly released devices are routed in hours, not weeks). The eDGe was easily rooted for some time (once someone put their mind to it), although enTourage I think changed something a few months ago so perhaps the original technique no longer works. Doesn't mean it can be done