In TDM, I have been using the HATR recently. To my surprise, it showed me that not only do the spawns change rapidly, but the enemy team actually spawns at different locations at the same time. I was in the middle of the map, and saw that enemies were spawning on both ends of the map at the exact same time. This leads to another random variable, awareness confusion, never knowing where to look, and ultimately being able to die from any direction at any given time thus bringing down the skill gap and ensuring that everyone is at a 1 KD.
This happens when your players are just rushing all over the place instead of having gunfights.
You can thank jet packs, wall runs, and specialist challenges for this.