This is a good idea. The mods can find all the list in one place.
This is actually a bad idea.
With the individual threads, the mods can deal with an issue and the thread will end. Easy to see on the topic screen.
With your method, the mods have additional administration work in keeping track of the status of each complainant.
@AdolfinWolf - separate issue. Your thread is "planning", this thread is "reaction".