Then most of the ordinary consumers(people) will confuse and lose the motivation to ask for this receipt. Because a lot of Chinese people don't, don't need and don't know how to fill tax return.

The government don't want to do that as well, because if then they are indirectly educate people there is a concept of tax return exists, which is most people don't aware of. That is a big chunk of money government steal away from people every year.