Yes, I agree with all you said.

Conclusion No.1 from this post:
Never go to China without a Z visa you can obtain prior to departure from the Chinese Embassy in your country. Any school or recruiter telling you any other thing most likely is a crook and IS NOT TO BE TRUSTED!
The only legal visa for you to work in China is a Z visa.

Conclusion No. 2 from this post:
Basically, all foreign teachers - whether "blue-eyed" and with "white" skin or not - are all in the same boat as far as working and living conditions in China are concerned. There is no reason to look down on foreign teachers from Asian countries, e.g. Philippines or similar.

Conclusion No.3 from this post:
As a decent and qualfied teacher, you should love your students and feel responsible towards them. But be very critical and careful as far as your employer is concerned and watch them carefully - you have no obligations towards them whatsoever if they trick you in or do not honor the contract. Speak up or leave if something is really wrong and cannot be settled with them. In such case, tell your students why you are leaving. Hopefully, they will also leave the crap school and stop the employer to make money on other people's back!