I'm kind of a braking sensitive dude. They don't have to be great brakes, mind you, but however they performed when the bike or truck or tractor was new is what I expect.
Example: I have an old KLR that represents minimal braking expectations, and a 2006 KTM 950 Super Moto that was one finger Brembo braking beast.
Like RonH, I don't remember if I have ever needed a new rotor or even getting one turned, on a motorcycle. But unlike Ron, just last Friday I had an appointment with my truck dealer to get my front rotors turned on one of my trucks. Cost about $95.00. Other than the rotors needing turning, the 30,000 mile truck has perfect pads and clean fluid.
Like I mentioned above, I could sense the lightest bit of front brake rotor warp when braking softly and gently. Not so much when I braked harder. So it was not drastic.
But after they turned them, man could I immediately tell the difference. It was like the day I drove it off the lot! I suspect the wear that some would consider premature was due to about 15,000 of those miles with an RV and a load in the cargo bed? That definitely asks more from those front brakes.
The Tenere is notorious for the back brake pads wearing pretty quickly for those that do a lot of pack-mule\2-up riding. So I wouldn't be shocked if that rear rotor might need looking after for a high mileage Tenere with that burden.