Does removing this really help us? It's very little code, and when we want to update brotli in the future, the easiest/safest thing would be just copying everything from the updated version, at which point these will be recreated, or each time we'll need to exert additional effort to keep them out. Seems better to me just to keep everything intact, even if a few pieces are unused.

Sounds reasonable. One important file that was removed after @dotnet-bot's original mirror commit was CMakeLists.txt. That is used by the fuzz script and the tool. Should that file be kept intact as well next time in the same spirit?

Presumably it was removed to prevent them from being built? If so, that seems like a good reason to diverge for that file.

As stephen mentioned, we can remove this without any negative impact now, but a future update will likely undo the work. So it doesn't much matter either way.

Ok, I will keep an eye on progress on Google's side.