I absolutely agree that firm action must be taken against this owner for making his own changes to common property. We had an owner who changed he common property area outside his unit because he apparently didn’t like it and thought his change was much better. Some of the bleeding hearts on the EC did think of just letting it go. But common sense prevailed when it was brought to their attention that it would be a free for all in the complex with all owners changing what they didn’t like. If you don’t take action against one, you can’t take it against another. He was made to reinstate at his own cost.
Despite taking action against this owner and getting him to reinstate the common property, he went and did it again elsewhere, and the EC went and took a action again. But thankfully, other owners have taken notice and we have had no changes to common property since.