When I first started to learn guitar, I found it a formidable task to try and memorize all the various scale patterns (I still do). To illustrate the difficulty, look at all the notes on the guitar neck in the key of C major. I'm sure the seasoned player can quickly pick out patterns they recognize, but to one who is not familiar with the neck, this can look just like someone blasted buck-shot all over the fretboard. Now consider switching keys mid-solo, and having to transpose this pattern to a new location on the neck. Or going from C major to A lydian. Yikes!