Giving Wiki Loves Monuments the worst possible situation is certainly not a compromise, but a situation in what users from the community are crushed under the weight of the foundation. A compromise is, according to the dictionary, a situation in what both parties concede something. In this case, WLM concedes everything and WMF nothing.
I have seen already users asking if this will be the next big clash between WMF and the community, after the VisualEditor, MediaViewer, Superprotect and other issues. I personally hope not.
You are of course free to think how much negative impact it will have, but I base my numbers on the statistics from the past years. We have seen each time a big influence from conflicting banners or outage. We have followed the statistics and the impact of past years and we have learned from the past that it has a big impact we certainly should not underestimate.
And I disagree with your statement that there always will be a clash somewhere. There is no need for a clash if people work together on the planning. September is not the only month in autumn, and not all countries are occupied by Wiki Loves Monuments. Suggesting otherwise are fairy tales. This is one of the strongest examples of bad planning I have seen in all the years. Of every country that organises Wiki Loves Monuments, they have picked the worst possible country.
You reduce this problem to just a "number of emotive emails", with what you make clear you missed the essence of this case.