Then they must want Brawl to be Melee.
Aren't the fighter pacs and codes for Project M compatible with Brawl+? Just yesterday, I swapped Falco and his moveset with the Project M's Falco. For some reason, I couldn't do short hop lasers that often. Is it supposed to be like that in Project M?
And what do you mean by dreadfully unprofessional?
You mean the people who followed Brawl+? The early development scene for Brawl+ originally intended to make Braw like Melee. Thank god they didn't because the hacking scene was greatly underdeveloped and they would not have been capable of making the breakthroughs that the wizards in the Project M team have been making. What we got instead was, personally, a much more enjoyable version of Brawl that's fairly well-balanced and faster paced albeit rather disappointing in many of its decisions (especially as a Link main).
And no, a large number of global codes for Project M (called fighter.pac injections) are specifically tied with the character files to make them work with the huge changes. L canceling and the Melee Air Dodge are two major cases. Landing Detection (just recently fixed) is specifically tied to animations and other factors which weren't entirely discussed in-depth with the public.
From what I've seen in your posts, you're clearly new to the scene in general. Brawl+'s history goes quite a ways back. I wasn't present for a lot of it, but I've certainly read a bit on it. There were tons of conflicts; the developers were split and at one point, there were two different versions of the mod. Some bad decisions were made (like Ness being broken) and they listened far too often to the audience, which was often composed of very inept players who never took the time to explore the characters before giving ideas except for a few particularly good people.
The funny thing is that Project M is mostly (or was at the start) composed of former Brawl+ developers who left when they were at it with the other developers. Project M grew extremely popular, essentially because it was what a lot of people wanted the whole time.