That may all be true, butyou have to remember that making weapons finesse-based is about balance as much as realism. If you make longswords dexterity-based, then suddenly using daggers and shortswords becomes harder to justify. It's also a bit more complicated than is strictly necessary.
Not everyone goes into meta gaming. I would still use daggers on my rogue, because it just fits her better roleplay wise. Hell, I gave my cleric more charisma than she needed... for roleplay reasons.
As for OP, I'm all for it. I prefer longswords than 2h swords personally.