I'm going to be putting a load of wood chips on my heavy soil garden. In the short term, that can take a lot of nitrogen to break down, robbing it from the plants.
I know there is a lot of concern about wood chips robbing nitrogen from the soil for the decomposition process. A year or so ago I watched a video on the subject, and their conclusion was that if you used wood chips as mulch, the only area affected by loss of nitrogen was the immediate few mm's of topsoil that touch the wood chips. Since gardeners are more concerned about the nitrogen down at the level of root growth, that magic 6-8 inches, there was no loss of nitrogen.
If you till wood chips into the soil, then that is another issue and you would see nitrogen loss wherever and however deep the wood chips were tilled into the ground.
After my plants are well established and growing well, I would use wood chips as mulch without hesitation. Having said that, I now use chicken run compost mulch instead because I have so much. I think the compost mulch is even better because when it rains, all that good stuff in the compost drains down into the soil to feed the plants.
[the coming shortage of fertilizer] has been mentioned on other threads, mostly talking about commercial fertilizers impacting commercial food/grain production.
I have heard about the increase in price of fertilizer, but not so much about a shortage.
If you listen to the news, there is a huge fertilizer shortage, which is going to decimate our food supplies, and our store shelves. Take it for whatever you wish.
I listen to the news everyday, but I guess the type of news I listen to has not been too concerned about the fertilizer issue. I mainly watch national and international news, not so much local news and issues that might affect our local farmers.
My point is, THAT does not have to affect us, because we are making our own fertilizers.
Agree with you on that. I make so much chicken run compost that I give some of it away free to my neighbors who also garden.
Like you said, WHAT shortages? WE already know how to fix that problem.

I literally have $100's and $100's of dollars worth of black gold compost sitting in my chicken run ready to harvest. I cannot remember the last year I ever bought commercial fertilizer or compost, but it was well before I got my chickens. Even before I got my chickens, I had started making compost at home and used that instead of store bought products.
Does aging [urine] make it better than fresh, as aged, some additional chemical stuff happens, to possibly break down some components into something more usable by plants?

OK, so I have been online reading up about this human urine issue. What seems to be the consensus is that human urine is not sterile, it contains a small amount of bacteria. If you bottle up urine and let it sit for a few days, the bacteria will multiply and grow. That is not good.
Not to be gross, but if you have to drink urine for survival, it is recommended you drink your urine as soon as possible to prevent the small amount of bacteria in your urine to grow in your container.

Now that's a bit of knowledge that I never, ever, hope to use!