Good article on how much of Melee seems intentional https://smashfts.wordpress.com/2015/02/09/melee-is-an-accident-i-disagree/
Good read. I've always held this view, but this sheds some more light on the idea.
I find it hard to believe that a group of devs and playtesters didn't realize the ramifications of fast-falls and L-cancels, and they obviously weren't unaware of traditional fighting game design concepts. I just can't imagine the team NOT having played lots of 1v1s during development, and that surely would have influenced the final product.