I probably shouldn't jump to conclusions or dwell in "negativity" (I like to call it "realism"), but will of course now do it anyway:
The marketing people are in charge, the coders have moved elsewhere. Firaxis gets away with modding their own game, because they mostly cater to show-boating streamers (and their audience), war gamers, multiplayers these days. Cheap new stuff -> more Let's Plays -> more visibility. Slipping standards (zero patch notes).
So a thing like the powerplant issue naturally gets overlooked / swept under the carpet, as the game is "decided anyway at this point". More cynically, such entertaining exploits drive youtube views upwards.
They seem afraid to touch their own code at this point, because the knowledge has left the project, different platforms and DLC combinations are tough to manage, testing hours are limited. (also less charitably: the codebase might be a bit of a mess) We'll see if there's some sort of patch later, but it's definitely an afterthought based on their communication.