I don't get the hate. I'm ready for massive "respectfully disagrees" because this thread is largely a massive echo chamber, but pops are more productive than they used to be on a per-pop basis. It's far easier to specialize planets now, and you can make planets with nothing but researchers on them right from the start, provided you have other planets to provide whatever resource is your upkeep for the researchers. Once you have more pops and tech than another empire (and early growth is actually stronger than it was before if you min-max properly), you can just go on a conquering spree and you've won the game, the rest is just mopping up other empires.
It doesn't matter if late game you have half as many pops as you would have had in the old patch when the pops are twice as productive. And even if your pop growth is lower than another empire's it is because you already have more pops than they do. That's more alloys, more research, more ships, better ships compared to anyone else. A pop right now is always better than potential future pops, so empires that can maximize their early growth will have a huge advantage over empires that grow slower, even if the first empire's growth tapers off quicker.
Sure you can't snowball as hard by being passive the entire game. But being passive all game was never an optimal way to play, and it still isn't. The game is all about being passive until you have a workable advantage and then exploding out onto the galaxy. The empire-wide growth penalty also isn't really that bad. It takes a lot of pops to become really crippling, and by the point when you're in a position to be crippled completely by the new pop growth clamping you've probably already won the game due to the sheer number of pops in your empire compared to everyone else's.
The angry voices are always the loudest, but I bet there are thousands of people happily playing the update right now and feeling just fine with the new system. I know I am.