You gave plenty of good reasons for preferring backpacks in your own post. I guess I don't really understand your question. Are you asking if there's anyone else in your boat, where none of those things apply, but they still prefer backpacks? I prefer a backpack because I am constantly finding myself walking long distances through, as you say, "non-suitcase friendly pathways."
Another aspect, and maybe this is more of the type of thing you are looking for, is that there's sort of a backpacker culture, and carrying around a backpack is the most readily identifiable badge of membership. You can still be a backpacker spiritually, but if you're pulling around a suitcase, you're more likely to be identified as a vacationer than a traveller, and those are quite different things.
Some more practical reasons to prefer backpacks even in suitcase-friendly environments are, for me, that I have a backpack and not a suitcase. I do a lot of camping as well as travelling (actually I've hardly done any travelling at all lately, sadly), so I'm more used to the backpack, and it's worth more to me to invest in gear that can be used for both purposes. The backpack also seems more useable to me (although this may just be an effect of habituation). It has a lot more segregation of storage in the form of external pockets and straps. I can get at my raincoat, tripod, camera, maps, phrasebooks, insulin, sunglasses, etc without even slowing down, while with a suitcase I'd have to stop, open it and root around. Also, as a security issue, if I decide to stop and take a picture I'd have to let go of the suitcase, but I can maintain physical control of the backpack.
One last note which is kind of related: Have you heard of travel packs? They are cleverly designed backpacks that convert into duffel bags or soft-sided suitcases. Some brands even have wheels and pull handles. They aren't really made to be fully equipped hiking backpacks, but for the occasional train station--hostel trek you can hump them, and for trains, planes, and respectable hotels they seem just like normal luggage.
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