That's all around China. I haven't seen much of difference in each province, besides small shops vs upscale restaurants.
The stir-fry dishes are oily. Some baozi are oily. Some small shops have served me some very oily fried rice. The continuous use of the same oil is the food concern with expats here. The street food some people don't trust or deem it has poor quality.
Sometimes one incident leads to the general belief like that baby formula incident years ago. They still use that as the excuse to buy imported baby formula over domestic.