it has nothing to do with how many files Steam downloads, and the result is the same on every platform. What matters is which shaders are changed or even touched by the devs. We had updates where a minimal damage was done to EDHM, and we had ones where pretty much everything reverted back to original, because almost all of the UI shaders were modified or touched in some way.This is covered at least a dozen times in this thread. It amazes me that people still don't know about it. It has literally happened every single patch.
That's part of the beauty of Steam though: only about half of it breaks. Most of the colors remain the same after updates because Steam doesn't download every file and overwrite them; it only downloads the new files.