May I ask what were the complaints regarding? If we make a comparison, reducing happiness may prove more effective and useful than not having that effect. The main reason I ask for the happiness reduction effect to be resumed is because of the max happiness bug. When a pokemon reaches max happiness, it sometimes needs to be knocked out and healed and its happiness raised again to evolve. This is particularly hard and annoying to do if the pokemon is a very high level such as 98-99.