Whether you leave the accessory down, or raise it off the ground, depends on your task. That said, if your tractor is under a fair amount of stress pulling an implement in a straight line, with stress equalized between the 2 stabilizer (for raising/lowering) bars, you're going to transfer a good portion of such to the outside bar when you make the turn, and if excessive - yeah, you could bend/break something. As to the toplink, it's not usually a problem in turns.
I was trying to conjure up some mega-force with turns, ones usual for farming (which I don't do any more), and pulling a 180 degree turn at the end of discing or plowing a row (by locking the turn side rear wheel with your brake pedal), in order to line up for the next row, you better raise the rear implement or something, sooner or later, is going to break (and it may well be the implement rather than your hitch).
As far as box blading, raking and the like, and as per prior posts, don't worry about turns - not enough stress to hurt anything, at least not on most of the good tractors available today.