Your poll isn't very honest Psycho. You wouldn't need 15 weapons. But having different resistances adds depth to combat. It forces you to change tactics and changes up the combat a bit so you can't just smash through everything in the game easily.
Okay, if you haven't personally played a game where you wind up having to carry around 15+ weapons, that's fine. But you have NO PLACE to be criticizing my honesty. I play Dungeons and Dragons Online. You want me to list the weapons my characters carry around?
My monk/rogue, who is UNCHARACTERISTICALLY NARROW has:
+5 Metalline Flametouched Iron Handwraps of Improved Destruction. Breaks Silver, Byeshk, Adamantine, Cold Iron, and Good DR. Basically used for dealing with raid bosses who almost all have multiple DR types, usually Something + Good.
+4 Corruscating Handwraps of Disruption (undead beaters--do Light damage and Disruption)
Unstable Handwraps (break lawful AND chaotic DR)
Calomel-studded handwraps (dragon beater)
Grave Wrappings (my epic and evil set)
Scorching Wraps (breaks piercing DR)
+2 Banishing Handwraps of Stunning +10 (for dealing with outsiders)
+5 Metalline Handwraps of Smiting (construct beater, also breaks Silver, Adamantine, Cold Iron, and Byeshk DR)
I'm unusual because I got lucky on Metalline drops--many people have separate adamantine, cold iron, and silver sets. That, and because I use handwraps, I only need 1 weapon per set and not 2. I also don't have a slashing set because this particular build doesn't have enough wis to get Vorpal Strikes. I could carry kamas but they usually do less damage than just standard handwraps, even with the DR penalty.
Baldur's Gate wasn't too bad in this respect because it used the SECOND edition rules where Magic trumped everything (except arcane oozes). But, it didn't have DR--if you didn't have a +3 weapon on the mob that needed +3 or better to hit, you did NO DAMAGE WHATSOEVER, whereas when enemies have dr 10/slash, if you do more than 10 damage you at least do SOMETHING.
Still, I'd rather not have the Insane Weapon List in this game if it can be avoided.