Most 15" powered speakers with horns weigh in about the same as the G70 in a case. LOTS of us use those!

Anyway, if you can turn playing a flimsy lightweight action into a VIRTUE, surely getting in some honest exercise every day ought to be good for you...

Anyway, cases are meant to ROLL, not lift... Can't remember the last time I had to lift the whole thing. Perhaps you guys need a lesson in leverage, rather than One Finger Chord systems?