The reason why PNR is NOT recommended was originally started by me/somebody else.
It can happen/ and it has happened on another similar site, where a PNR was posted, and that passenger was approached at the station by a person saying he is from that forum and wanted to "help" and took some money and vanished. Further, PNR gives out details of coach and passenger travelling.
ANY PERSON without logging in can visit this site, if he/she/gang finds out passenger travelling alone/lady travelling alone/other circumstances, they become easy targets for unruly elements...
more... as their status and position is known in advance.
For example, I can carry out a print out of the PNR from the site, and show that I am a 'real member' of indiarailinfo, and can even convince the TTE to allow me to travel with them till I can do something... undesirable at times. It is a precautionary measure.
Nobody, nobody who visits this site/member should entertain any such attempt UNLESS there is a personal one to one interaction with the person offlink or offsite. An example here is I Know Jitesh, Hetul and a few others .. From their language I can make out whether or not they are real Jitesh, Hetul or not.
It is only for your safety.
Good wishes.