As for Classic straps getting caught offroad - WTH do people use the daft shoulder strap method for closure in the first place? I worked out pretty quickly that a simple side to side join one the roll was secured was much quicker, easier and unlikely to snag. IME the shoulder straps are more problem than help even when carrying - the bags have a built in handle that works very well after all!
I'm pretty much with you on this, though I do find there is a point to using the shoulder strap when you're pretty much at sealable capacity as the two ends of the roll don't have to meat one another. But that is once-in-a-blue-moon stuff and I almost always join the two ends of the roll after snugging things down with the central strap.
Using the shoulder straps for a carry is similarly an occasional thing rather than the default, notably if I want my hand(s) for something else. But for the most part I let the shoulder straps rattle around in the bottom of the bag and don't worry about them much.