Think about it, you'll have "your" dedicated FA if everyone else is asleep, no? I wouldn't think that will make too much of a difference when compared to 6 pax having meals at the same time.

I don't know about the 77A, but on the 74A what you have said is indeed the case onboard. Sometimes the ISM will come to the F galley if he/she's on shift. There's always the FAs from J too.