Static movement rates that are a holdover from wargaming:
Reynard the Nimble STR 10, DEX 16, CON 12 rogue? 30-ft. movement.
Maximus the powerful, strong and coordinated, mighty-thewed physical paragon STR 18, DEX 18, CON 18 fighter? 30-ft. movement.
Herbert the Unremarkable NPC with STR, DEX, and CON all at 10? 30-ft. movement.
Heironymous the wheezing bookish unfit STR 6, DEX 8, CON 7 wizard? Guess what? 30-ft. movement.
For a game that is so painfully laser-focused on the nitty gritty of highly specific movement rates, how many feet you trade to jump X, different ranges for each weapon, AoEs, etc. it can't seem to move past those old static rates where every member of every species moves at precisely the same rate.
I use zone-based combat for Theatre of the Mind simplicity, but I used a simple approach to convert all static rates into d20 modifiers (also modded by the highest of STR or DEX for sprints, or CON for longer runs). And in cases where cinematic movement matters (chases, races, escapes) you roll. Sure, being stronger, more agile, etc. will give you a significant edge, but if you roll low enough, and the other party high enough, the unexpected can happen, even if only for one round in several. And in-game, that's the moment you slipped, or some NPC pushed a food cart in front of you, etc. Way more exciting while offering a bit more verisimilitude too.