Do you really think that majority of people who played basic D&D consistently used those charts? Because I seriously doubt it. You seem to be fixated on one very specific goal of play and very specific way of achieving that goal.
Yes, I do believe they use those charts. In all my days of playing those games we always used those charts, or else developed specific charts which accomplished the same thing. Wandering monsters are a KEY component of classic D&D play. Now, I admit we were less likely to use 'town' encounter charts, although we did use them in cases where the PCs were essentially 'wandering around looking for trouble' or otherwise engaged in something 'dungeon like'.
The problem with not using wandering monsters is, it actually causes a lot of issues for classic play. The PCs can simply loiter around all they want and thus it is easy to do things like heal and reacquire spells without even leaving the dungeon. This is exactly what these mechanics were meant to do is include these tactics in the risk/reward cycle.
I mean, maybe you created some alternative, that's fine, but the point still stands. In any case, my greater point was that the principle of "explicit risk/reward" is an unwritten, but clearly extant, principle of classic D&D.
I think D&D has pretty much ideal amount of rules for romance. But sure, if you want to sell a romance RPG then you probably want to write some bespoke rules and convince the potential customers that they actually need your product.
OK, and how would you use the D&D rules for that? The only parts I can see being of much use is INT will let you read/write/speak different languages, potentially (there are no rules in classic D&D for which ones you have learned however, beyond certain starting choices). Beyond that CHA obviously has some uses. You can use the reaction tables to see if your 'date' decides to stab you with a salad fork or snuggle! haha. Maybe you could make ability checks for other things, STR to impress them with your mighty thews, CON we'll skip my thoughts on that, DEX? WIS, maybe you can make a WIS check to know better than to date half-orcs? Honestly, there isn't a rule in D&D that is really going to help you. You can CALL it 'D&D' if you want, but it is going to be all just made up at the table, or cribbed from some other game. Beyond that you will have to create a process of play, procedures, etc. that work for this type of game.
Whether 4e classes 'work' depends entirely on what you want D&D classes to do. 'Fulfil an artificial gamist role' is not high on my list.
Yeah, nice. I'm thinking this thread is getting a little long in the tooth perhaps at this point. The quality of discourse seems to be going down...