I think these changes are not really getting at the FUNDAMENTAL ISSUE with population. The goal of these changes seems to be to reduce population by simply reducing the rate at which they grow. But this approach fundamentally fails to address the real issue at play. POPs = Power.
Wow.. a text wall , to forget that pops are power. you can't do nothing about it, pops are a form of power. the idea that someone can be powerfull with a state of 10 pops against someone with 100 pops is pathetic.
you can still use tech to overshadown pops numbers ( even now) and with those new tech it will be even more significant.
pops are one of the powers. and you can't do nothing about it .
pops , tech , fleet power . all are chained to each other , but separate .
edit: and tall is just about rushing habitats and megastructure , to have more space for pops .
the concept of "tall" is to use space efficently . and i realy don't want to start a war of " tall vs wide" , in stellaris you want to have both .
the balance of stellaris is that someone with a small space , is faster to use it efficently , someone with a big space is slower at using it efficently. if you are more small , you want tech, if you are more wide you want pops . in both cases, pops \ tech will increase your fleet power .