It probably goes without saying but I will say it anyway... these are all devices to give you ideas for notes to use in your improvised (or even composed) MELODIES. Melodies is the operative word here because after all of the mode-learning is done, if you just run modes up and down, or even just arpeggios, your melodies will sound boring, even though all of the notes are right. Balance, register, rhythm, tension, timbre, dynamics, articulation are all things that need to be incorporated into a melody so it sounds musical. This is why a lot of people say modal playing sounds dumb, because these elements are not woven into the modal melodies. I guess what I am saying is whatever scale you are using, you must always strive to be musical and expressive, not just be satisfied with getting the right notes.