FormerlyHemlock
Hero
You can justify however makes you feel good, but it's a fact that the two orcs who beat you on initiative could move a full 12" and block the exit that was 2" from your character before your character could do squat. That would be impossible if combat was simultaneous. In a simultaneous combat, everyone would be able to react to every inch of movement from everyone else as it happened and not have to wait until someone else was done moving.
It's a fact that you could declare "I want to shadow the orc, staying at least 10' away from him at all times", and that would be impossible in a turn-based IGOUGO game.
And what makes you think I never played with proportional movement anyway? You seem awfully confident in your observations about things you have no knowledge of.