Guitar is an accompaniment instrument, as a guitarist you spend most of your time accompanying other musicians, it's important to keep you chord vocabulary updated to keep things fresh.
Whether playing the melody on songs or having a guitar solo, knowledge of scales and arpeggios are vital.
Locking in to the groove is bar none the most important skill any musician should have. These exercises guarantees vital rhythmic skills.
The most effective way to learn new things is to try it immediately on real world playing situation. Guitarahub gives you the opportunity to use your new ideas from the exercises and share it to the world.