I think you have misdirected your reply to my post instead of to one of Dr Turnoi's.

I have not made blanket statements about recruiters, unlike him!

I feel I must point out that China's visa legislators have reserved themselves the right to change the visa regulations without prior notice. It's possible that at the time a visa run to HK is commenced by a laowai, Z visa conversions from L visas are still doable. But after the laowai reaches HK, he may discover the regulations have been changed while he was in transit to there, and so he couldn't obtain a Z visa. Basically he would be up a creek without a paddle!

I do not advise any prospective FT to enter mainland China on any other visa type than a Z visa!