Maybe the way you worded it, but I change my oil at the end of a season, so the bad stuff does not sit all winter, but it also starts the season with new oil. Seafoam in the fuel before winter storage. I do pretty much what others do here. But the simple task of regular fluid change is probably the single best thing you could do for your bike to keep it running well. A Kawasaki shop manual will tell you everything that needs attention, follow that and you will be fine.
I have never lubed the final drive splines where they slot into the wheel.
Thats amazing. I'm not doubting you but am trying to imagine how you've gotten away with that.It does say "Apply grease to the splined portion and the circumference of the rear wheel coupling" but I have never done so. It always seemed odd to me to grease something that shouldn't move at all except when removing/fitting the rear wheel. The only movement in that entire area should be between the coupling and the wheel itself via the cush-drive rubbers. I have never seen a damaged rear wheel coupling and I have several spare rear wheels and have worked on a lot of GTR1000s over the decades. Since Ottos pumpkin is now leaking there will be oil in the coupling now but he is due his big service shortly so I'll strip and clean the coupling/wheel & cush-drive then and inspect the splines on both sides. If I remember I'll take pics and post them here.
I believe the FSM calls for heavy moly grease (that won't fling off) to be applied to the splines at each tire change, at least that's what I've been doing.
The wheel side splines are designed with softer metal as a wear item, in theory to prevent wear on final drive side too?
I've seen some wheel side splines worn to a razor's edge rather than their original trapezoidal shape, and other's with varying degrees of wear, again all wheel side. The 'pumpkin' side has always looked the same.
There have been other incidents where some of them are worn smooth, causing the rider to think somethings wrong with the clutch because the bike won't move when in gear and the clutch out, just rev.