Similarly, I have never once seen any DM play a game of D&D where a combat didn't start with "roll your initiative" which has always been that number on the character sheet dictated pretty much entirely by the Dexterity score.
Sorry to burst the bubble of your idealized world-- but in the real world in which people actually play the game, encumbrance is virtually never a thing (it gets invoked about has often as people remember to mark off rations or track their water) while Initiative is an absolute constant of the game.
Then you have not played with me as the DM I did away with that system and went to what they call the popcorn method of initiative. Some times I decided if them or the monster starts first or we roll a d20 no modifiers yes i know some end skills rely on it that is easy to take care off. Been a great success at my table at keeping players more engaged
Here is a link about it
http://angrydm.com/2013/09/popcorn-...and-pathfinder-initiative-with-a-stupid-name/