I haven't read a whole lot of the past posts, just a forewarning. But I did check out Wobbles' posts. So I have two things to say on the subject.
1. I prefer l-cancelling manually. I'm someone who still needs to master l-cancelling and I would still rather it be manual. It's not what separates n00bs from pros or whatever--but I think that there is a technical aspect to it. When there are a million things for your hands to do in a match, forgetting one of them can mess you up. Let's say it's a heated battle and you're going for the grab that would give you a lead. But say you missed JCing the grab. If you're playing someone like Ness and use his running grab, you're going to get punished pretty easily.
The thing is, in this situation the pressure didn't cause him to miss an l-cancel. But the thing is, this player hasn't been l-cancelling for enough time to make it natural, and so he was so focused on getting that l-cancel a second earlier that he missed JCing his grab.
The thing is, l-cancelling is a chore and it does just add another thing that you have to do. Like JCing grabs, there's never a time you don't want to l-cancel or JC a grab (so far as I know about the latter, anyhow). But having to do these things means that you need better finger dexterity. That doesn't mean that people with poor finger dexterity can't play, it just means that they have to practice more.
This way it DOES separate those who have been practicing and have been getting their tech skill down perfectly from those who haven't.
For me, adding another 'chore' that you have to do while playing is important. It makes Melee a harder game to play. Taking away chores like these make Melee a more relaxed game, but what I like about Melee is that every button you press counts and that you need to be focused on getting everything down at all times--and those who haven't been playing as long will have sloppy tech skill. L-canceling is just a part of this.
I don't hate the fact that I need to l-cancel manually. I realize it's a chore but I don't loathe it. I know that it's making me a better player, because it will force me to have to get the timing of hitting multiple buttons quickly and keep my mind sharp on that level. It's too easy for me to lazily play Marth, but when I'm forced to employ a bit of tech skill, the lack of finger dexterity shows.
And even if you never want to not l-cancel, that doesn't mean that it's a useless tech skill. It changes from player to player when they l-cancel--you do have 7 frames to do it. And it also matters if you're pressing L, R, or Z. And if you're pressing L it matters whether you're pressing it halfway down or all the way. All of these things contribute to how fast your fingers can get to the next button. The way one person does it may be superior to another person's. It may not change the game a whole lot, but it will make a difference, even if it's only a slight one.
And if you think talking about frames is nitpicking then you must think powershielding is also nitpicky. For better or for worse, frames do matter and do come into competitive play.
2. And here's my second point: Why does it matter? L-cancelling isn't going to change any time soon, so we might as well get used to the fact that it is manual, whether you think that's a chore or not.
Anyway, sorry if I repeated previous arguments. If I did and they've already been dismissed as invalid, just say they've already been brought up. You don't need to repost whatever you said before. I know it's frustrating having to hear the same thing over and over for people who haven't read the whole thread.