Update: Playing Production Line reminded me of another game in my library called Big Pharma. And then I saw that they were both games by the same developer. PL is great if you love manufacturing in many steps, but Big Pharma is the superior game in most ways.

The following is the text of my review back when it was 'positive':

In my experience, this entire game is more or less entirely about keeping yourself afloat long enough to max out research, and then making the most high throughput factory you can.

A core mechanic that I haven't bothered interacting with at all is in mixing production. If there's a bottleneck at a facility somewhere, you can alleviate it by moving production of cars which don't use that facility for as long to said line. I get around it by just making luxury vehicles.

the game is broken... dont waste ur time

Very Fun! 9/10
(In depth Review to come)