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And stop telling me what to do unless you pay me.
Timescale is an abstract concept, not a real world event series like email, and as such, it may be designed to fit whatever it purpose is. IT needs uniform, monotonic and deterministic time, and UTC fits badly, although better than local time with DST adjustments or some hypothetical timescale with floating second length.
I really wish TAI or some predecessor of GPS timescale was chosen for computer timescale. Leave astronomic events to astronomers.
People worked with chunks of plutonium and almost no protection for years, and even minor incidents with chemical weapons tend to leave some wounded and dead. I believe in case of launch failure unburned rocket fuel would be more dangerous than plutonium.