The difference between this and Victoria is that the automation of the industries already happened. The pops already have industrial tractors, boring machines, and more to minimize worker count. Replacing the key remaining workers with Robots is the last step in fully automating the industries.You can't have 1 pop unit still be working the same sized area for 400 years. So to do so from the start achieves almost nothing but creates problems: You will be having explosive growth and lack colonies and jobs. And you're taking out the sense of progression that you would have otherwise. The system needs to be flipped on it's head, because pop growth is flipped on its head.
If I were to take this a step further, I'd have pop needs be based on job outputs, so that a pop working on an inneficient job would be angry. but that's a whole other discussion.
You can mod district job modifiers, but they apply instantly, either across the empire or a single planet. And of course you can mod buildings seperately by level.
As for explosive growth, you can still keep carrying capacity and double the growth cost of pops to reflect they're rarer now.
Your suggestion isn't so much fixing the issue of pop growth slowdown as it is shoving it further down the line.
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