Not necessarily simplicity, just more static factors. Complications are part of the joy of certain lost elements of the classic Halo franchise, such as Plasma Stun, Grenade Bouncing, Weapon Launching, and Button Combos.
But these all had something in comon, they were static. There was nothing random about them. They were factors that existed that everyone had available at ALL times, and which had the same consistent outcome every single time.
Then when you look at Loadouts, AAs, and Ordinance, what you see is unpredictable and random. One player could spawn with a completely different weapon, ability, and set of perks than everyone else, and all of a sudden that player has completely different capabilities than everyone else, such as being capable of moving faster, or holding more grenades, flying, or having a one-hit-kill weapon on his hip. None of the other players are capable of doing the things this player can do until they die, THAT is a problem.
With Ordinance, it’s completely mechanically random. You have no idea what your options will be, and everyone gets different ones. When one player gets a Rocket Launcher, and the other gets a Needler, well obviously the game is lopsided and unfair. When a Rocket Launcher spawns in the middle of the map, every player has the ability to attempt to pick it up.
There has always been a small aspect of random you need to deal with in Halo games, such as weapon spread, Assymmetrical map advantages, and on some level respawns. But for the most part these little bits of random are something EVERYONE has to deal with at all times. It doesn’t disable one player any more than it disables everyone else. But that’s no excuse to pour more and more random elements into the game.
On the topic of Sprint which is separate. It’s just a matter of why fast base movement without Sprint plays better as a rule.
The reason is combat, you cannot Sprint and engage combat. And when you Sprint you only Sprint in one direction. The involvement of Sprint means that base movement needs to be slow. So what we wind up with is base movement too slow to be useful in-combat. Strafing is ineffective, trick maneuvors happen so slowly they don’t make a difference. And yet Sprint is too fast, you get away from a fight so easy and the only way for someone to get in position to finish you off is to… STOP SHOOTING. It just doesn’t work.