The idea is you have the choice between fighting 16 zombies out in the open vs fighting 4 semi-stealthily inside.
Yes, it does a little bit. The difference between fighting roaming zombies outside and POI zombies outside is that the POI zombies is that the roaming zombies ideally would come at you from all directions, while the POI zombies come from the same direction, often in a conga line. While it's still possible and/or feasible to kite an omnidirectional zombie attack, it certainly would be more challenging.
Maybe you're right that kiting is too easy. That's really not hard to fix: just make zombies lead the player slightly instead of going straight towards them and suddenly it's much harder to outflank them. I implemented the leading AI (only a few lines of code) in one of my game prototypes, and I found it takes about half to one third the number of enemies that use the leading AI vs beeline AI to catch a player that can move 2x as fast as them. It feels like being hunted by a slow-moving pack of wolves.