People can be naive or devious doing their reno and often think they can just do it and will get away with it when the dust settles or the owners corp just concedes not wanting to cause a fight.
Usually the offenders only see it all from inside their apartment and don’t consider the impact it has on the exterior or other peoples investment. If everyone played it that way it will be death by a thousand cuts and then when it looks horrible eventually you all pay a fortune in whole of building rectification costs or the unseen lesser sale price when you sell due to your building looking like a hack job. Investors also potentially lose out in higher rents and better quality rental tenants.
I strongly suggest you ride your committee to go in real hard, and if they dont you should take it on yourself and go the offender yourself. That in itself sends a strong message to others there who also think they can do the wrong thing.