The information I provided is statistical as I observed with my friends and colleages getting RFE.
One of my friend's name (He is in H1B) was wrongly entered at port of Entry by Immigration official had problems in getting Fed Tax refund. He was called three times by Social Security local office and once by BCIS local office. I came to know that BCIS, SSA, IRS share their data for Aliens from him.
dengdeng, if you are more intrested, do more analysis with the people reported RFE. Also, post another poll with points that generates RFE. BCIS is not bothered on the technical or business area of the applicant.