If Demon Slayer took place in 1926 Japan, 8 years after WW1 ended, then Why didn't all Demon Slayers use guns that shoots sun absorbing steel bullets wrapped in exploding wisteria oil to kill demons? Genya killed an uppermoon demon using a sawed off double barreled Winchester shotgun for fucks sake.

Shut the fuck up, you nit.
Do you even know how many folds these samurai swords have?
Did you know that the perfected slicing technique used by a master swordsman can cut an apple in half without it even realizing its been cut?
You are a disgrace to your family.
Commit seppuku.