Originally Posted by
Spectator
In the specific example you quoted, the OP said that their EB2-I-140 had recently been approved.
It could be, that when the A-file was updated, the IO noticed there was no written request to interfile the new EB2 I-140 with the existing I-485 and the RFE was issued to ask the person whether they wished to do so (when the PD becomes Current).
More generally, USCIS are quite aware that EB2-I dates are likely to move forward in the near future.
While pro-activity is not a term I generally associate with USCIS, it is entirely possible that they are pulling files likely to become Current and pre-processing them to the point of approval (including issuing any necessary RFE), rather than waiting for them to become actually Current to begin that process.
The IBIS checks have to be not more than 6 months old at the time of approval, so these have to be updated at some point, otherwise they will have no approvable cases.
USCIS work in mysterious ways - best just to accept that fact.