Of corse it can thats not the argument. Your a good photographer right? and if your shooting 5k images a week you must be a commercial photographer. When you know what your doing its a lot easier and if you are shooting that many images, yours need to be spot on or you would never be away from the machine. That is the argument how many peoples are spot on out of camera?
This isnt a pro competition it is for fun, most pros dont have time to sit and spend hours, my workflow on PS is around 10 mins because I go to the correct lengths in camera but then like you I am a photographer and make a living from it. In that respect if your looking for a perfect image then PS is not a huge concern to most pro photographers, but I think more so for amateurs wanting to have some fun. So when you want to do something more creative then it is, or if your pic out of camera isnt correct then making it a correct exposure or even touching your images to create a desired aesthetic, removing dust or objects that remove attention from the subject. So I think removing something that aids creativity or a unique aesthetic is a negative step.
But I agree a themed month would be cool.
But again if your shooting B+W out of camera they are bland, lack contrast and are very flat and need some kind of contrast adjustment. Again like a blanc canvas, I don't no any pros that would shoot B+W out of camera, also means if you even needed the colour version then you couldn't have it. So again post processing.