but Shirobako isn't a perfect model of realism (which isn't necessarily a bad thing in my view).
Yes, it isn't a bad thing at all and I don't want to frame it as such. If it was a dealbreaker, I wouldn't be able to enjoy anime.
But I appreciate this specific kind of plausibility very much, and when I take a step back from anime and consider fiction holistically, it ranks high on my list of priorities, probably second only to aesthetic flair. It's something that I feel is missing from the vast majority of anime, so its presence here is very much appreciated.
From the start, I thought GN could go two ways.
1) Full cute girls doing cute things (New Game)
2) A self-aware periscope into the industry (Shirobako)
I was prepared for 1) even though I was hoping for 2). 2) was a longshot, and I had to constantly keep my expectations down. So seeing them met and in some ways exceeded had a dramatic effect on me.
EDIT: Also it helped GN's case that New Game aired last season which was beyond disappointment for me. It was everything I didn't want out of a premise like that. Imagine Sound Euphonium. And then by episode 3 the girls were just running around in panties, groping each others' breasts and blowing their instruments sexually.