As someone who works/worked for all major Chinese smartphone brands (and some major vacuum cleaner brands) over years I can tell you this is no OnePlus specific, 996 is just Chinese standard.

I remember back when I lived in China some of my flatmates slept in work overnight since it was encouraged, you save time on commuting.

I worked also on OP project which was handled separately from O/Rm and V/IQ, but I find in general approach of these companies very amateurish when it comes down to providing reference materials, though it could be even worse, unnamed company selling mostly in India is disaster, now they use AI to localize their phones, you are suppose to check it with no screenshots, no description, so clearly can't even check it properly, so apparently AI is doing fine since you can't really report worries anyway. And if you will drive EV from the biggest CN EV company expect same, they are not better.

The most professional are H/H and X, no complaints there. They are at Nokia level professionalism from back in the days.