BMW is a luxury car more than it is a performance car, regardless of the fact that it performs better than many other cars.
If you don't believe BMW is following Mercedes in the luxury/prestige pursuit go to the BMW research center in Munich and ask them
Someone at BMW decided its better to market the tires as never requiring roadside swaps than to perform best, to the performance-addict's bane.
This is what I see happening "Warning: Do not replace BMW run-flats with non-run flats, the springs and dampers are engineered for run-flats" or something of the same tune in the Z4 owners manual.
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