I don't actually disagree, I just find it galling that we cannot react to a post but mods can. My forum used to buzz back in the day, it got gobbled up by social media. It is still there but not quite the vibrant place it once was. But I would never allow someone to post on a locked thread. It sucks of elitism.
Could you not just have reacted to the post on the locked thread by starting a new thread to do just that? ...... oh