Horwath
Legend
Maybe. But the point is whether a cleric or fighter who need saw a khopesh or shuriken in their life should be able to just pick it up off a dead foe and use it properly without penalty.
maybe not the same second.
but in a day sure.
If you know how to fight with a longsword then you will know how to fight with a katana or kopesh.
same way when you buy a new gun that you never saw in your life.
But, it's a gun. you take it one day to the range, you sight it in, and you are good to go. It does not matter if it is an AK47, a Glock 17, a Famas or AR15. It's the same thing when you sight it in. You just need to be more beefier for some guns. But that is another topic about weapons and min STR for them

not worth a feat or a multiclass level.
hell, it's not worth a tool proficiency