They really wanted to emphasize team play, but they did so by simply nerfing everything globally and looking at some underused features and then applying a handicap to players so that they need to take advantage of the features (SP change).
Adding more hp to enemies is a way to promote teamplay sure, but that’s more of enforcement rather than encouragement.
They could have really taken a look at some classes and found really unique and interesting ways to encourage cross-class teamwork that also promotes the general idea of the class. Like a passive effect that can be accomplished almost exclusively through teamwork that benefits the team but doesn’t hinder the solo experience
Some examples could be say Schwartz Reiter, who is a mounted ranged unit. Historically they were about their mobility and hit and run tactics. So why not give them a passive that makes them do a powerful aoe burst if they could hit the enemy from a certain number different angles in a short time span. This would require the enemy to be focused on someone else or be locked down in a way that prevents them from rotating to face the reiter. The reiter already wants to be moving and shooting, so why not reward them for playing to the class’s strength?
The Peltasta/Matador could passively increase the damage by a small amount that monster’s aggro’d on to them take from sources that aren’t the peltasta/matador
The Doppelsoeldner grants a small amount of sp to allies after defeating any enemy they personally get the killing blow on (they’re all about killing for financial gain, so why not reward them for swiping kills)
There are alot of possibilities for benefits that are small enough that solo players can miss them, but significant enough that teamplay becomes exciting and engaging and wildly different depending on the class combinations you are with (yknow, the main selling point of this game)