I got its charm, but not the point. Still enjoyable.
The point of Coen movies is hidden between other equally valid angles to enjoy the movie, to a degree where the point appears or actually IS unimportant. What sets these films apart is exactly what you said, they are crafted in a way that lets you enjoy and laugh anyway. And coen bros will be happy about just that. But in the end you might be motivated to sit down and think.
For me personally the meaning and greater comedy of Lebowski was to spawn a christ-like figure into modern America (LA even) where the original values of christianity and the Jesus image itself were long forgotten and distorted into the opposite of what Jesus stood for. Naturally a guy like him is not welcome in a so called Christian country where money, aggression and fake success ended up ruling. Dude is a kind man, a patient and tolerant man who will however never debase himself in front of authorities (malibu sheriff, fat lebowski) however, a person of strong convictions (nihists don't believe anything, they are worse than nazis) who stands his ground. Living the NEET life hanging with buddies and chilling with hookers he represents the image that religious fundamentalists wiped out in favor of beating kids with a ruler or banning a player for blasphemy in Italy. There was a nod towards this interpretation when the old cowboy said something along the lines of 'isn't it comforting to know that he is out there....the Dude....takin' it easy for the rest of us'...like 'Jesus died for the rest of us' the Dude is absorbing our troubles because he doesn't give a shit 6 billion times over. Ironically, followers of The Big Lebowski didn't see it and started a real religion called dudeism (based on taoism)