A) because the fantasy setting lends itself to actually having monsters.
B) the often slower-paced gaming style can make a better use of a diverse “cast”, as you have the time for Monster analysis, e.g. elemental resistance, magic resistance, etc.
C) it didn’t plop out of the writers pen all at once. It’s a vast “ecosystem” which has grown for decades, with a myriad of writers adding to the environment, as compared to a single writer who’d have to keep track of all of those monsters in one go. Compare it to let’s say Egyptian or Greek mythology, same story.
A) because the fantasy setting lends itself to actually having monsters.
B) the often slower-paced gaming style can make a better use of a diverse “cast”, as you have the time for Monster analysis, e.g. elemental resistance, magic resistance, etc.
C) it didn’t plop out of the writers pen all at once. It’s a vast “ecosystem” which has grown for decades, with a myriad of writers adding to the environment, as compared to a single writer who’d have to keep track of all of those monsters in one go. Compare it to let’s say Egyptian or Greek mythology, same story.