Gentle Cruising sometimes.
More often fast, somewhat aggressive riding.
Don't scrape the pegs, but feather the rear brake into turns to keep the drive line loaded and to control speed into the twisties, rolling on the throttle into high rpms.
This is a wonderful bike. No it isn't a sport bike, but as a heavyweight, luxo-tourer it is in a class by itself. Solid in the corners, the weight adds stability and comfort, and the engineering provides remarkable handling for a bike of its size.
After learning the limits of the bike: Lean angles: yeah, you can scrape the pegs and bodywork if you like grinding on the bike, I just keep lean angles shy of where the scraping occurs.
RPMs: watch the red line and learn where the rev-limiter kicks in, I just keep it below those RPMs.
This bike can be ridden anyway you want, but IMO if you always ride it like a GoldWing or HD bagger, you are missing the point.
There is no evidence that riding it hard will contribute to final drive failure.
If you are really worried about FD failure (you probably don't need to be) I would rebuilt it with a new bearing with careful attention to proper assembly. Faulty bearings and improper assembly are the two primary suspects in FD failures.