Ryno I see on some DRZ forums they do what they came a locktight mod. Its not really modifying anything they just coating the shaft in red locktight so the countershaft sprocket is all but glued in place.
The reason some do this is they can get some slack and the shaft can wear over time. I have not done it to my bike and have no problems. I check it during regular maintenance.
I think those who have the problem are motard riders and those who do big km’s of commuting on tar. As the DRZ doesn’t have a cush drive hub it transfers the load to the countershaft sprocket and shaft.
For dirt riding the tyre has less grip on the ground which make life easier for the drive train.