The “oops, I didn't get round to it because my cat's been sick and my mother visited from Dubbo and I don't get paid for this you know” scenario seems most likely. Pity help the person who buys into a building thinking it's pet friendly, for instance, only to discover it's not according to a by-law passed 18 months ago but never registered. Maybe there should be a statutory form on which you have to write new by-laws, record the date of the meeting and the result of the vote which goes straight in the post for registration as soon as the meeting's over.