Playing as Germany is it worth it? -10% is a lot in production loss but rise of Stability may be worth it. But in the first part of the game there is so much else to use political power on. What are your thoughts and experience?
You can already max out Germany's build slots by 1940 without taking it. Unless you need stability for a reason other than output, I doubt it's necessary to take.
The OP also says "first part of the game" so I took that to mean the buildup period from '36-'39.I think you are mistaken which decision the OP is asking about. Improved Worker Conditions adds .5 stability per week for 180 days at the cost of 5% consumer goods and 10% factory production. So basically in the end you come out with +13 stability. If you do it twice you've almost negated the stability penalty of -30 for being at war.