I don't really want to turn this into a 'lol l-cancel' debate, and I do agree with your philosophy of tech skill + strategy = win. I disagree with your example though. Guilty Gear tech skill is all about increasing your options, for example spending tension. You start out inefficiently with supers, which are risky, and move onto FRCs which are harder but more efficient. GG is actually really clever in the way a lot of the characters become increase in options as you 'unlock' them, increasing your versatility, mind games etc.
L-cancel though, in Melee is something that, once you get down you do every time. Nothing wrong with that, it's a linear gauge to technical skill, but there is
never a situation where you shouldn't l-cancel and do something else instead. The new Brawl system gives rise to some airs that are safe on land and others that are very risky or designed for air to air or are better in different parts of the jump. I honestly think they haven't done a bad job, though I've only had one session with the game so far.
Nevertheless I fear for Brawl the same reason as you do, but there is another game out there which much less technical skill that thrives to this day, and that is SF2ST. The game is much less tech skill and more strategy as posturing and position become far more important, a fighter more like chess is not all bad.