I see it. Higher temperature will result in the fuse blowing at lower than rated current. Just as riding on a lower than recommended rated tire can have disastrous consequences if riding in, say, Phoenix.
Yes, you got the tree, but you are missing the forest. My point is that a given set of attributes may be selected for reasons not obvious from the attributes taken in isolation. There is no published value for tire stiffness or dynamic response. I am speculating, but given that BMW moved away from radials in the later models, I am suspecting they found a harmonic interaction issue between the radials and the suspension (aka tank slapper). They likely picked a tire with a combination of load rating, speed ratng, and construction (bias ply with REINF sidewalls) to avoid a nasty dynamic condition.
Sure, tire makers could make a range of tires in each load and speed rating with different stiffness values, but that just increases costs, when the same thing can be accomplished by picking a tire that has more load or speed capability than "needed" for a given bike in order to get another needed characteristic.
Just as fuse makers don't make a range of 10 amp fuses for 25, 50, 75 and 100 degrees C, they give you the design rules needed for the engineer to pick an appropriate fuse by derating for temperature as the application dictates. I strongly suspect the same for tires, but the attribute may be dynamic response rather than something simple like temperature.
However, as I have often said before, it is your neck, not mine. I am simply trying to educate folks that selecting tires isn't as simple as looking up load range and speed rating. Having said that, I am done wasting my time trying to teach those who refuse to learn.