Wouldn't playing be predictable then?
Same creature, locations, loot, etc?
Discussion
No. Every environment has different monsters with different chances to encounter for each monster.
Right, so you'd just be playing the same environments over and over again to get specific loot, etc, hoping x monster pops up this time when you play.
This is the exact issue I ran into creating my dnd thing. There wasn't enough creative randomness, like having a human DM, to actually make the game entertaining.
There is more to do than just kill monsters and get loot. It's about progression. Leveling stops at 20. But it should take a very very long time to get there. There will be quests to do to get special magic items. All sorts of NPCs... Etc.