Hopefully the airline and CAAC will do a good job of investigating and make sure that any lessons learned are shared widely among the Chinese airlines.
Oh yeah, they will publish a report with safety recommendations. Bwahahahahah. You must be kidding right? The only thing that will happen is that some of the pilots will get fired/fined including those that may have been resting.
I've seen and continue to see Chinese based airlines fly straight into a CB at night. I can't understand Manderin so no idea if a deviation was requested but while I'm deviating around wx, a lot of them will fly through it.
Wx deviations in China are not easy sometimes but certainly not impossible if you are firm and suggest you will have to declare a pan. I heard KLM do this a week ago and the controller gave him what he wanted. Never had an issue with ATC deviating around wx over Siberia.