So many things do come down to judgements about what is ‘reasonable’ and what is not.
We have a few unit owners who seem to think that it is unreasonable for anyone to do anything that causes even the slightest change to the outlook from any window of their unit. Another thinks it is unreasonable to be able to hear ANY noise created by a neighbour.
Most people accept that living in quite close proximity to others will obviously and predictably lead us to be aware of them occasionally, whether it is a little BBQ smoke or some talking or music or whatever. Most accept that people will alter the landscaping in their units or that minor changes to the common property landscaping are necessary occasionally.
I had a very charming neighbour who was very quiet nearly all the time but about three times a year he would have a big party with very loud music. He would include all the neighbours and it would go late into the night. I don’t think anybody minded because he was so nice about it and he did not do it ‘unreasonably’ often.