I don't have any problem to answer. The situation in China doesn't allow anybody to achieve good results in middle and long distances.
China is divided in 32 Provinces. The average population per Province is about 40 million people. Many Provinces had facilities of high level, and could organize every type of Championships with very good organization. However, IN ALL THE PROVINCES THERE ARE NOT COMPETITIONS, no one provincial competition in one year. Every Province want to organize one or two marathons, for having big numbers, but this is not a stimulus for local athletes, since there are 20 or more African in every Marathon, and Chinese athletes don't take any prize.
Last year, in Chongqin we had the selection for WCh. I put the first two women in the race (Ding Changqin 2:26:54 and He Yinli 2:27:35), but there were 22 Kenyan - Ethiopian, and in the Men race 32 African.
In 2014, I had also athletes of track, looking at Asian Games. Somebody improved dramatically : Zhao Jing, starting the training camp in Duoba (2400m altitude) at 10th July with 2:07, won bronze medal with 1:59.48 after less than 3 months of training. The same Ding Changqin, starting the training camp with 15'55" PB in 5000m, won silver in 10000m with 31'53" (16'20" + 15'33"), and 3 days later bronzr in 5000m after pacing till last lap, with 15'12". Li Zhenzhu, no performances under 9:50 in steeple during the last 4 years, won silver with 9'35".
During winter, Chinese Athletic Association cut all the athletes of track, looking at Marathon only (and the athletes of track were the one with more possibility to reach the final in Beijing).
Chinese athletes are very few : there are no clubs, so every Province is like the only club in all the big areas. Athletes and coaches are paid by the Provinces, and their only interest is to be competitive, once every 4 years, in the National Games (like domestic Olympics). All the other international competitions are, for the Provinces, a big disturb.
Chinese athletes are not allowed to compete using their individual passport. When they have to compete, they are "in mission" : this means the plan of competitions must be done 7-8 months before, and with the level of the athletes this is not possible, because, also if CAA pays all the expenses, the organizers can't accept the athletes till last minute, so at the end they can compete abroad only in institutional events.
I wrote a report of 33 pages to CAA, explaining that their system is against the possibility of a development in the events of middle and long distances.
They give the responsibility of that situation to the "low level of coaching in China", but I explained nobody can be motivated to become a good coach if the athletes can't compete, since there is not motivation.
Last year, the time of the winner of the last national meeting (there are 4 national meetings with the participation of ALL chinese athletes, where it's not possible to achieve good results because of the big amount of athletes competing in every time of the day) in 1500m for women was... 4'36", that means 300m far from Qu Yunxia when she ran 3:50.40 in 1993 !
I showed them the difference between Japan and China, comparing the two Countries as performances. One example only : in 2014, looking at 10000m Men, there were 254 Japanese under 29:30, and... ZERO Chinese.
This means not bad coaching. This mean in one Country there is athletics, in the other Country there is not.
I went China not for coaching some athlete, but for changing the system. After two years, I understood it was not possible. For that reason, and for not wasting my time (I'm 71...), I preferred to resign, maintaining very good relations with all the Chinese I worked with, because I found very nice and educated persons, but not the possibility to produce results.