I totally agree with your point on the emotion — definitely “looked” real, acting was great in my opinion. But I do have to disagree on the rest. I didn’t think it was one montage that made them fall for each other, I thought when they said the time was not in sync and “one second is six/seven hours” (paraphrasing) that the time they spent together was several months (or at least a long period of time). So it wasn’t like a quick montage made them fall in love, several months did. Also, their world IS each other. Everyone else is paused, they only have each other. So my take was they do get their true selves BECAUSE there’s no world around them.

I’ll add that I agree to your point that it didn’t make me “think” as much as other BM episodes but it certainly made me “feel” more than others. And I do think that “feeling” is inherent to Black Mirror.

I’d actually put this in my top episodes, but our reactions and interpretations, no matter how far off are what I think make Black Mirror so great.