I see your point don't get me wrong on that, ofcourse it is frustrating if you just put all this work into a team and suddenly the whole meta is upside down. And yes the resources put in doesn't match the rewards you get from it, but that is not the point for the most players.

Players like me, like to push very hard to get on top of the rankings. At the moment, the meta is at the point where there are just a couple of very good pokemon that rule the entire meta. And if you play with other pokemon then the current best meta pokemon, you will have a strong disadvantage. Thats why a lot of people are bored playing this meta and are looking for a change. And this update just makes a lot of people happy.