I don’t know what kind of backpacking you do, but when I’m not hunting I like to be ultra light. My backpacking bag weighs 18oz, my Kifaru weighs approximately 5 lbs (80 oz). My backpacking bag is unquestionably more comfortable at the weights used for normal backpacking. The hunting backpacks only really show value over backpacking bags over 30 lbs, below that they are less comfortable, way too burly/not flexible (especially if you are scrambling, etc), and obviously heavy.
Anyone who tells you their expensive hunting backpack is just as good if not better than a high quality backpacking bag doesn’t know what they are talking about. That’s coming from a guy who owns an expensive hunting backpack.
Different gear is better in different applications. You just need to decide where you choose to draw the line for your gear being acceptable for any given situation.
Just buy the hunting packs you want and keep your ospreys for backpacking.