In-game characters in multiplayer are artificially stimulated to do better since:
- They get stats bonuses from other chars in the game
- The experience and loot that drops from monsters is multiplied per number of chars
- There may exist other bonuses from multiplayer
I use the word artificially since if a monster holds X number of items and grants Y number of experience, it should not magically grant 4xX and 4xY in a 4 player co-op scenario (even if it gets stronger). This is not logical and is purely done to stimulate multiplayer.
Also, why one player skills should be able to buff another? In the real world battles from middle ages for example you could get protected by an ally in battle, but this is due to some interaction between the two of you at the expense of the ally - he is sacrificing time and his defense to save you.
The above 3 gameplay mechanics only make sense when multiplayer needs to be stimulated artificially. Logically it doesn’t make sense at all. If a person in the street is robbed by two guys he would not give them more stuff than if he is robbed by a single guy.
If one’s character is away from battle without fighting at all, why should he get the same experience as those fighting?
That is why I ask you, should co-op be artificially stimulated in D4?