In a tabletop setting, the rules are there to facilitate the shared experience, whatever it might be. If you have a table that enjoys 6 hours of rules lawyering, great, have fun. If you have a table where every so often you have to stop them from shoving the rules lawyer in a locker and throwing them in the marianas trench, great.
But the key point is, it's a shared sandbox and everyone is supposed to find it engaging, without actively ruining each other's experiences, and anything else is more or less secondary. The interesting part is more or less the human fuzziness and collaboration of it.
I was once in a tabletop one-shot where the DM had premade character sheets for all of us. I noticed almost immediately that there was a tac nuke on mine, and when I asked, the DM admitted that they had accidentally left it on there from the thing it was copied from, and let me keep it.
An hour or two later, when the oneshot had devolved into people all taking potshots at each other from cover, our mission having rapidly unraveled, I pressed the big button on the thing nobody else in the party knew I had, the DM sighed and informed everyone that not only were we all dead, but a significant fraction of the city we were in was now gone.
In many environments, that would have been actively hostile to the other players' enjoyment, and gotten me banned from the table, but in this case, it was both very funny for everyone and not the end of the oneshot, because then on our next bodies, we all rapidly had to switch to fighting to get everyone else blamed for what just happened without admitting anything any of us weren't supposed to know.
So there are certainly tabletop settings where the table vibe is going to be that pitching a solution like the Peasant Railgun is going to fit, and there are certainly cases where even proposing it is going to get you moved down a tier or three on the DM's "do I want them at my next game" internal counter. You just need to not be so bad at reading the room that you actively spoil other people's fun.