i must say you are not alone mrs antichef and i took 2 flights last week on the same pnr and booked as prem econ. i am *G and she is *S. both times we were seated separately in different rows!
not that it mattered as i was pleased to see the midhaul aircraft on the and burned a few GUV's first time and was op-upped on the return leg.
ps there will be occasions when i would like to be seated in different rows - but sot sure that i could put that request in the booking ( or know in advance

)