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@gbj_tester
ftfy
Coarser would be better, but some engineers still get a fit of vapours if you transmit torque through a threaded coupling. Rohloff, who know something about engineering, use a 6-start thread on their sprockets, which seems like an improvement on a simple single-start thread
Bolt on is good, although it would need very big chainrings for TT gearing since 15t is as small as you can go (and even then only by using special bolts) on the ISO disc bolt pcd, and smaller pcd would need smaller bearings, which is unattractive. If you don't need small sprockets, ISO bolt on is probably the best system currently in mass production.
Splines yes, Halo splines maybe not. I don't think the Shimano HG spline on which it is based is well designed for reversing loads, and backlash not only wears the splines but also tends to unwind the lock ring.