I understand that music theory is only a guide, not a rule. But you can't simply throw all that away like that. A single note off a scale you started on will sound weird. Two melodic lines played together, following different scales will sound weird. Of course, you can take advantage of this in genres like dark ambient or any other genre that the objective is to cause the sense of unease to the listener, but with most electronic music that rely on melodic passages, you need to maintain a melodic line that will sound good to the listener's ears.