Yikes! I know we're trying to slow things down but I did the math and it will take 3 eras of complete research in Welfare to be able house the max number of workers. I'm not saying it should be instant, but I think trait trees like Extended Reach and a few others in other buildings are WAY overpriced, especially considering they don't even have a Superior Trait to upgrade to.
I know we are trying to slow the way people progress down, but this has it at a pretty big halt. Population is key to even being able to complete research, and players can't have it for at least 6 months. There are many other trees like this as well including DL stat trees.
My solution on this is to have all the trees that go 5, 10, 15...50 down to 3, 6, 9...12. It will still take 2 eras of complete research to complete them and that's if you solely go for it (obviously). I do like the idea that some things do cost more than others as they are worth more, but this was a bit extreme.
I'd also like to throw out another suggestion based off that last statement and this may just be wishful thinking but here goes. DL stat traits were nerfed by 50% then had their cost tripled. I feel like it would be better to just give them (and similarly effective traits) a cost of 2, 4, 6...20. It would still take quite a while to complete a single tree (1.5 eras if you focus only on that tree, counting the DL tome in it still).
Those are just thoughts to keep everyone progressing at a reasonable rate, because 50 trait points for a single trait is insane, especially when it's for only .5% more ranged damage. Remember, to get the full effectiveness of these traits you do need the superior one which adds a lot more to the cost, keeping a good balance.