Taking chances is my guess. Each weapon is a "life experience"
The basic pistol is your normal day to day. The shotgun is your night out.
But that gauss cannon, or rocket launcher are those big risk moments like asking that person out, or going to that once in a lifetime concert.
"I can't go to that concert I have work tomorrow" "But it's literally their retirement tour and you love them!" "I know but...I really need this job"
Yeah it's the responsible decision to go into work, but you're going to regret missing a day of work way less compared to missing that once in a lifetime event.
If you're saving money it's fiscally responsible not to spend it, but your peak years of health are going to be wasted "saving for your future" when you're 60 and your body isn't as capable as it used to be. So you're ruining the overall "game"(life) by trying to conserve and inducing more struggle onto yourself just to save an extra buck here and there.
My only complaint of the game I have is pacing. I found the routes between fights to be boring, and the weird 2D sections never really provided much else.