Its about having the right towers with the right upgrades and placing in the right place (sometimes at the right time). Vast majority play in the same style, hence bottleneck at the same spot in ct. Because you know a zomg is coming at 35( for this map) you should prep for it accordingly. If you cant, its because you dont have the right tech usually. tier 5 ct players should be able to kill a zomg. Lets change the game mechanics to suit your style of play. Nope!
Only part i agree on is for the player who does best on any given stage that peeps get stuck at. Most bloons popped wins. Forget the previous lvls and lives. But i doubt you seen any changes as fundamental as this, as the game is over a yr old.