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The Miche splines are steel, so much harder wearing, and also cheap to replace.
In the case of splined sprockets of all the mentioned kinds, the design inherently has backlash because the whole point is to make life easier, and using a flank fit spline with sufficient interference to eliminate backlash would be a: inconvenient because you'd need a puller to get it off and b: impossible with an aluminium shaft because the sprocket would just cut a smaller spline rather than expanding to generate the proper preload.
Of course, the 6-bolt system has geometric backlash too, since the bolts are smaller than the holes, which brings us to the next important feature: all the sprockets are pushed up against a shoulder on the hub, and the drive should be by friction at this interface, not by mechanical interlocking of the splines or bolts. It's a clutch, not a pin drive.
Six M5 bolts at 6Nm gives about 36kN of clutch spring load, with larger diameter pressure surface than either style of lock ring.
A 1.29×24TPI lock ring at 40Nm gives about 7kN of clutch spring load. The smaller male thread lockring version of centrelock is a bit less than that.
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gbj_tester
PhilDAS
So splined cogs and hubs (like WI and Miche carriers) just rely on the spline interface being beefy enough to cope?
Vs the much smaller splines of centrelock