the robot gun vs nazis had like 1000 variables that this stuff can work.
I seriously don't get that argument. "There's 1000 ways that plan could have gone wrong." Maybe. But I imagine few of them would have been satisfying to watch, so... why should I care?
Just imagine there are 1000 different co-existing alternate Breaking Bad universes and in 999 of them, Walt failed and his plan just went to shit in a lackluster fashion. In one, Kenny just shoots Walt immediately without even asking Jack where he should do it, and Jack slaps Kenny for killing him in his living room and they get in a big fight over Walt's dead body and it's revealed that they're gay lovers and Kenny is leaving Jack 'cause this is the last straw, then it cuts to "Executive Producer: Vince Gilligan."
But you're the lucky 1/1000 that got to see an ending that involved things luckily or not going Walt's way in manner that was (arguably) satisfying. Our Breaking Bad universe is the best one.
(At least in this episode, it could be argued when Walt took the chance on a plan that could have gone wrong, it was very clear he wasn't intending to get out if it alive, and as such, he didn't have much to lose.)