I cannot see why FAs might not like this. Perhaps it's one of those things when, a person doing a particular job can see detail that the regular person does not. I know that, in my job, I have commented on a detail to another observer and they were entirely unaware of what I was referring to. This is not once but constantly.
My only query is that - I would want to be watching that ON an A380, so I could see if you really did have that much space between the rows in Y.
I know that, in these videos, they tend to 'move' or 'fade out' the other rows, so as to be able to provide a close up perspective of the pax in their three seats BUT, I would argue that this makes it unrepresentative of what it will really look like. But, we have discussed in here before that no carrier is going to give even an inkling about that.