As far as I can see one BIG problem in NSW is where EC grant permission to lot owners for changes to common property with just an ordinary resolution and NO conditions.
This well meaning strata can then find themselves liable for any ongoing maintenance to this alteration (which they assumed would be taken care of by the lot owner) because maintenance of common property defaults to the strata.
This is why a bylaw as suggested by Whale should be mandatory in every NSW Strata, in fact I would go as far as saying it should be included in the sample bylaws shown in the Strata Act.