A TRUE worldbuilder spends 90% of their time obsessing over how their made up shit works!
Personal example (briefly): Spent months agonizing over how zero-point/vacuum energy generators in my sci-fi work, even knowing the explanation isn't necessary.
What I've ended up with: Teams of super-AI found that injecting electromagnetic pulses into the background quantum foam (the omnipresent source of zero point/vacuum energy), in extremely long, hyper-specific, seemingly random patterns, is like performing arbitrary code execution on it.
A self-reinforcing domino effect then makes the foam's local energy density spike like crazy. Energized virtual particles from it spontaneously become a plasma soup of "real" photons, protons, and electrons, supplying both matter and energy.
Energy is conserved, as the surrounding vacuum energy density temporarily drops at the same time. This drop spreads at lightspeed. So, despite how realistically, natural vacuum energy density is ultra low, it spreads so far and fast that this doesn't matter, and still seems like conservation was violated.
So, that's that in a nutshell.
If you have your own examples of being terminally unable to resist agonizing over a big nerdy explanation, even when you know you could just handwave it, you're free to share too, lol.