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The thing that makes harming others wrong is the lack of consent. That allows us to avoid the sticky question of what is "harm." For self-harm, consent implied, what is "harm?" Exercise with a risk of injury? Failing to exercise, with a risk of decreased life span? Failing to optimize your exercise routine? Surgery? Drinking alcohol? Dating the wrong person?
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Most of your examples would not be considered harm for another...
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Re 1, why?

Re 2, yes and in 300 BC you're also expected to already have been 50% alive there.

Your egg can't explain consciousness or the arrow of time either. How is the person in egg limbo, the fetus being developed I mean, conscious? How does the egg limbo work at all? You're gonna need a big hand to wave the (meta-)physics of your little egg universe away.

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I'm not pretending to have solved the hard problem of consciousness. I just said what so far seems most likely to me, despite there being still many open questions, in many other theories as well.
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