Hoi!
as I understand, both you and Berto
Since you can read other people's minds you shouldn't need to make questions. Simply concentrate and read my thoughts, will you? :)
why the official orthography is the only allowed in this Wikipedia?
We stated that whenever a normative version of ANY language is available, that version is to be preferred in the user interface.
The situation is different when you have a number of "official" flavors of one single language (en_us, en_uk, etc). There are policies in en.wiki (just to name one outstanding case) that can be used as a model for this kind of situations.
As per content orthography, all editions are free to set their own policies, so far. We ALL pushed since the very start to have the two communities merge into one, (read the old messages if in doubt), yet we cannot force anyone into anything.
So far the two communities prefer having two separate editions. Why? Read THEIR minds to get an answer :)
Berto 'd Sera Personagi dl'ann 2006 per l'arvista american-a Time (tanme tuti vojaotri) http://www.time.com/time/magazine/article/0,9171,1569514,00.html