I think its a difficult situation, hence my question to the forum experts 
kiwipaul; if the scenario was a ducted aircon system located in the roof which required a new motor, is your opinion is that strata has to remove it rather than replace/fix it, similar to the aerial?
I would suggest in that approach the new owner would not be happy to have purchased a property with a major feature now to be removed.
In any case how would any buyer of a property, where they weren’t the first owner, have any idea if any feature of a property was ‘original’ or added by a previous owner without strata approval? Wouldn’t such a concept require a detailed description of the property when it first entered strata? Such a thing I’ve not seen (in my very limited strata exposure).
I’m sure there are different opinions on this but I was wondering if anyone has seen anything on it in the Strata Schemes Management Act 1996 as I haven’t found anything yet.