Should be playing D&D instead
Then you have my pity if you end up tossing out 90% of your game materials because you adamantly stick to the idea that once you've decided something goes somewhere that it can't ever move from that spot, even if the players have no idea about what you've decided and where you've put the thing, even if the perfect chance to salvage that material comes up later in the game.In a nutshell: Yeah.
Folks here are arguing from a position of cheating players who derive fun from trying to juke the game, to crack the DM's system, or as EOTB put it: "data-collecting to understand the curve around them". That kind of mechanical play is way meta, into the realm of min-maxers and those guys who show up with homebrew classes from the DnDWiki. A far worse sin, IMO, and not really something I'm comfy spreading in my group by encouraging that style of metagame.