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But, please explain to me.
Exactly
why is it that a half bet (usually) reopens the betting in Limit, but not in No Limit?
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That's what I was hoping someone knew.
Obligatory link to Robert's Rules of Poker (emphasis added)
SECTION 14 - NO LIMIT AND POT-LIMIT
NO-LIMIT RULES
3. All raises must be equal to or greater than the size of the previous bet or raise on that betting round, except for an all-in wager. Example: Player A bets 100 and player B raises to 200. Player C wishing to raise must raise at least 100 more, making the total bet at least 300.
A player who has already acted and is not facing a fullsize wager may not subsequently raise an all-in bet that is less than the minimum bet or less than the full size of the last bet or raise. (The half-the-size rule for reopening the betting is for limit poker only.)