there is really no need for sprint to be in any halo apart from getting cod fan boys to by the game.it rushes all ready fast game play making the game a cluster -Yoink- like cod.
were as this new addition of thruster packs could be one of the best things they have added to the game.
the thrusters mix up battle by putting peoples strafe off and can potentially increase the skill gaps of players when they learn to use them properly.
the biggest reason i hear people say why they want sprint in halo is so that they can escape battles easily, the thruster packs do this even more effectively than sprint as you can easily avoid grenades for example.