IMO, Brawl+ should not go gold until we have character-specific hitstun. Too many characters are limited in several regards because of how hitstun works: the floatier a character is, the less hitstun they suffer.
The problem with this is making a character floatier also makes them lighter and more sluggish. Bowser is a good example of what is wrong in taking this approach. In order for him to experience less hitstun and thus be less comboable, his dgrav was decreased, which makes him floatier and lighter. This means that he falls like a feather, which hurts his shffl game, and it makes him get launched farther by attacks, which makes him die earlier. Now, I don't know about you, but it makes no sense that a beast like Bowser should be so floaty and light, to the point that Fox dies later than he does. He should be a nice, heavy character.
Kupo's approach towards fixing this problem is through a universal dgrav setting, but I find that approach to be unsatisfactory as well. Many characters have benefited tremendously from unique gravity settings that truly bring out the best in them, and I don't feel that making hitstun affect everyone more or less the same is worth messing with all that character gravity tweaking.
Character-specific hitstun will let us have our cake and eat it, too. We'll be able to tweak characters currently limited by hitstun problems to play and feel even better. Bowser will at last be a heavy character without being a complete sandbag in the process.
Which brings me to another point: shouldn't we also get a character weight modifier, kinda like the one used for the Meta-Knight's Flimsy Armor code? I think it could be another useful balancing tool. Together with character-specific hitstun, it could be used to truly separate characters into distinct weight classes.