1) The articles was interesting, thanks, but not fundamentally different from anything I have read earlier.
2) As far as I am concerned, the 14-pager was not a constitution, but an ad hoc document no one had formally ratified, to state what the Taliban planned. As for later plans, they don't want anyone else's input: they want to appear as if they are not semi-educated bullies and apply unwritten customs in the regions they control.
3) Shari'a comes from the Koran, which does not say women have to cover their hair, faces, necks, limbs, or body shapes, but that women "should dress modestly." The many tiny rules based on unwritten custom for women's dress has never been negotiated, but imposed by bullies. Now that the reactionaries have arisen in Indonesia, they can't stand the lax customs and say, "It isn't Shari'a." Ridiculous.
4)I don't know about New Zealand and Israel, but England has a tradition of common law in addition to a written constitution. We have that here in the US. Abortion was legal in the pre-US British colonies - except possibly for a revision in Maryland - and the early US, because of common law. Is that what you mean?