The pop-in won't be a huge issue, just saying that in regards to this particular case, it's pretty damning. I definitely think people are setting themselves up for disappointment if they think the towns will be a densely populated as previously shown though. You're welcome to not agree with that, by all means, I'm not here to change your mind, but I'd rather be pleasantly surprised that it does than disappointed if it doesn't.
You may want to look again at the scene where Gladio's sis tries to flirt with Noct again. Its probably just that the areas they showed off during that time of day weren't sprawling.