Speaking of how play experience would vary depending on which rules you ignored, there were actually attacks of opportunity in 1e. They weren't called that, but the 3e rules largely codified and simplified the disparate mentions of the idea in the various places in the rules. In particular, you could not just "leave melee" in 1e. If you were in base to base contact with a foe - in melee with them - then if you tried to disengage from melee (break contact) you drew a free attack from every figure you were in contact with. And it wasn't just "an attack", it was an attack on the rear of your figure, which meant you were flat footed, couldn't use a shield, and the opponent got a +4 to hit you. Nor was there a 5' step in 1e, so breaking out of melee in 1e was painful to the point of being something you just did not do.
If you ignored that, then yes, missile weapons do get A LOT more effective, and hands down you should always use darts. The dagger advocates are taking a compromise position that if you do get stuck in melee, at least you have some chance of fighting back. And I can see that point, but for the first 3 levels or so it's still a terrible position to be in, and if you aren't rescued from the situation by a nearby fighter you are probably dead dagger or not.
I'd have to double check my math, but from memory a Str 10 Dex 10 1st level M-U hits better and does more expected damage punching than with a dagger against pretty much any AC opponent.
I didn't ignore the pummeling table and that probably skewed things.