But actually the value of the "original" share will not be adapted or diluted. On the market regulators (if any

) the original XEM will not start the day with a smaller value (because it "transferred" part of its value to symbol token).
Am I wrong ? Maybe I am missing something

You're better off starting a thread on here and asking the same -
https://forum.nem.ioI remember them talking about tax considerations influencing the nature of the snapshot and distribution process so someone official there, there's no one official here, should give you an idea. I can't remember myself.