That's not as bizarre as it might seem - you have to think about differences between game time and real time.
Say you are planning a trade route - yes, over the course of game time, you want the universe to be dynamic. Now, say you commit to something, for some reason you can't play the game for a couple of days. You come back and find that the profitability has massively changed, because other gamers have affected it over the course of real time.
If it was real-life, you would monitor the situation, and jump in when you need to. None of us can commit to simply jumping in to play the game at the drop of a hat, so a universe that is too dynamic over real time can be a problem.
Look at something like Football Manager - that's a dynamic world during game time. Games are simulated, players are bought and sold, managers fired and hired, teams promoted and relegated, all outside of the sphere of influence you have with the one club you are managing, and none of it is pre-determined. But all of that evolves in game time - i.e. only progressing as you play the game.