I see it as one more example of Dude not committing to anything and kinda quitting before anything ever pays off.

He keeps copying other people. He says their lines, he follows their plans, he uses their information and theories. He never quite follows anything through to the end.

Big Lebowski got one thing right, Dude is a bum and he says "fuck it" to basically everything.

Walter was pretty ridiculous with most stuff, but he's really good at three things: 1) hand to hand combat 2) home security 3) bowling.

Dude listened to his advice on getting his rug replaced, handling the money, tracking down little Larry, the interrogation of little Larry, and then when Dude's car gets dinged up he drops Walter off and goes to barricade his house without him.

He can't stick to anything. And maybe it's better sometimes to stick with something you know is flawed than to just drift about from idea to idea (like a nihilist). Walter is the total opposite of this. He clings to everything and never lets it go. He clings to Vietnam, his ex, judaism, bowling, crazy theories, his right to swear in public, his coffee, the money, and he would like his undies back.