Sure. The disconnect seems to be that since I only want the rules to work 99% of the time (its actually higher than that, but its not 100%), you jump to 'that means they don't work ever'. I understand why a person with your habits can make that leap, but that doesn't make the leap reasonable for most tables - and in fact, I specifically introduce rules for 'how to get an item you don't have written down' in virtually all my games, because I don't WANT any of my players to have to live by that. That's a very roundabout way of the ref saying 'gotcha' to the players, which I dislike. Just because a player forgets something, doesn't mean the character - a long term special ops marine - forgets ammo for his gun.
Continuing on, that means, it doesn't make sense for a GAME to assume that leap, whether a given player or group does. Most people don't consider something changing less than 1% of the time to be cheating, particularly when it's specifically done for the benefit of the story or gameplay - as you said, it should generally always be to the players (but not always the characters) benefit. But sometimes that 'benefit' is 'yes, you are right, it says pop 6, but you've calculated out that there can only be enough life support on this world for 600,000 people, and you're right again. So, since you had already planned to come to this planet for trade purposes, and had planned on getting certain modifiers - I was listening when you were discussing where to go next! - I'm not going to penalize you. You did the math, both for where to go this session, and for what the technology base means. So this planet, DOES have a pop 6 rating, and you get to use that. But there's also only 600,000 people here so that you don't find dead bodies on the streets tomorrow. Today (but not necessarily next session), pop 6 means economic power. Yes, I know that 37 sessions ago we found that planet that, for similar reasons when you were doing the math, ended up with 30,000 people with wealth, so it only had pop 4 for economic power, despite being listed as pop 6 due to the 5 million indentured servants there, and so in that case pop rating meant physical population not economic power because you picked going there based on its pop rating, in order to have enough sophonts for coming up with that psionic protection device from the rampaging monster that needed sheer number of minds to power it. This is exactly why I said that someday pop rating might not mean physical population despite that session.'