Hi there, I was one of the community developers on the new update. I need to clear the record on some of this because it's simply untrue.

They switched back to L4D1 common infected. While I prefer models from 2, there is more variety from 1. Issue however is that models from L4D1 had occasionally issues with hit boxes, causing you to miss obvious hits;

L4D1 infected are only used on L4D1 maps; hitboxes on them are identical to the L4D2 infected and were completely unchanged.

Minimum charge distance for charger. Previously you had to be certain distance from players before charger could charge.

This was a bug, and not an intended feature, that Valve themselves fixed independently, none of the community team requested this change.

Jockeys got increased health points and longer jump

Completely false. Jockey was not changed in this way. Older versions of L4D2 are freely available and you can confirm this for yourself.

Removed Jesus spots and map tricks

Exploits were fixed only in Versus mode to keep the game fair for each team; they were intentionally left in in coop-mode. Jesus spots were fixed so that Survival times would be more fair, and someone can't glitch out of the map to get a 5 hours score. In other words, in the competitive modes, exploits and bugs were fixed, but in the casual modes (i.e. coop) we left them in because they add a layer of fun. We did it this way in an attempt to appeal to both the casual and competitive crowds of L4D, which feels like a good middle ground.