While I understand where you're coming from, I prefer the way Ravenloft was treated in 3e--despite having gotten the Black Box and other 2e books when they first came out. The 3e books made the setting feel like a world, and I prefer that to the Weekend in Hell vibe of the 2e books (even if the Domains were ust as small in 3x as they were in 2e). Plus, as I said, there are so many monsters in RL. I can't imagine a pack of man-eating werewolves surviving in some of the Domains due to the low population, let alone a pack of werewolves and a couple of undead and carnivorous plants and vicious, possibly supernatural animals and violent humans.
Don't get me wrong, I am not knocking your opinion. I just feel like people are acting like S&S Ravenloft is definitive and I think that is a highly debatable notion (for many, the 2E line is definitive). But I understand your preference, you want a more real world vibe to it. And that is fair to want. It just isn't what I am looking for. I wanted something that was a little more surreal and more like we got in the black boxed set. All I can say is Ravenloft instantly made sense to me when I read that material. And all the stuff with population, either wasn't a problem for me, or was something where I just intuitively felt we were meant to understand there were more people living in the countryside or more communities and these were just the most notable
Like I might say the following: "Massachusetts is a spanning from the highlands of the Berkshire mountains to the jagged coasts of the atlantic. It has four notable cities: Boston, population 667,000; Worcester population 184,000; Springfield, population 154, 000; and Lowell, Population 110,000. The area boasts several successful sports team and is teaming with Dunkin Donuts franchises." That description would obviously not be meant to preclude the remainder of the 6.8 million inhabitants of Massachusetts or the other cities and towns.
I wouldn't imagine ravenloft being as densely populated, as its meant to be pre-modern (possibly early modern in some places). But I think that kind of logic was assumed when they made the maps and wrote the entries. And one good thing about this approach is every GM is able to look at Ravenloft and fill in those blank spaces (both literal and figurative) with their own ideas. So if you look at a domain and have this question about are there enough people for the werewolves to feed on (which I will be honest is not a question that ever really leapt to my mind, since I just embraced the surreal nature of the demiplane) you can easily imagine agrarian population surrounding the settlements, and people in the countryside, as well as other cities, to get you to that x10 number. Even I, who really am not concerned about whether there is enough wheat to justify the city population sizes, and whether the city populations justify the werewolves, would have pegged the population as being much higher than the numbers indicated by most notable settlements (except perhaps in cases like Lamordia, where they really emphasize how inhospitable and uninhabited the place is).