For some adjudication officers to have said that they don't tell to applicants whether application is approved or not after concluding the interview; or telling that they don't put a stamp on the passport about the temporary evidence of green card (I-551) if application does get approved then it's just a matter of their own personal modus operandi than as a matter of policies established/implemented by USCIS.
Most officers do tell the applicants if they do approve the application and most of them do issue/put a stamp on the passport about the temporary evidence of permanent residency...and many times without asking the applicants if they do want to get the stamp or not. So it's all about an individual officer's personal modus operandi. However, it is true that USCIS had stopped putting stamp last year until a few months ago because of fraud. Previously stamp wasn't included the seal of Dept. of Homeland Security; instead it used to be a simple ink stamp that anyone can forge to come to the US shores...at least up to the airport but now it contains the official seal of the dept. So, USCIS has re-started issuing the stamp.
Further, many officers just forget to take I-94, EAD, re-entry permit but that doesn't mean that application will not get approved. Sometimes they purposely don't take these documents as they need to get second opinion from their supervisor on the case.
Also, the status or emailing status on USCIS site shouldn't be taken seriously. Why? Because many times people don't get any email but do get their green card in themail. Some get emails a way back receiving the green card. So it's not worth to be worried on online status because online status doesn't always get updated by USCIS.
