I also agree 100% ^ ^

Something my Japanese partner always complains about is that when on flights that start or terminate in Japan and where the passengers are mostly Japanese, the instant the 'fasten seatbelt' sign is extinguished WHAM, every single seat goes into full recline almost on cue, and remains that way until the plane begins descent.

If the ladies from Singapore Airlines have to insist that all their pax have their seats up even if the seat behind is empty, it must be because of situations like this where they have to enforce an actual policy.

Personally, it wouldn't occur to me to keep my seat up whilst somebody behind me could be eating (whether I am or not - and regardless of their size), and I will pull up my seat at breakfast time even if I am still sleeping and have declined the meal.

I don't like the idea of being forced to do this if there is nobody behind me, but if this is going to help the airline crew (i.e. dealing with someone else refusing to comply because they're pointing me out and saying "well SHE doesn't have her seat up!") get people to implement this basic courtesy, then I understand and accept this.

If I was in C (unlikely to go to F) and there was tons of room, I'd look round and make sure the person behind was comfortable - adjusting my seat as necessary. Mind you, the last time this was an issue, the pax behind me was an FTer, so there were no problems with calling out: "you alright mate?" periodically.