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which is their design choice, not an obligation.

Electron really messed up a few things in this world

Which is even better for incremental updates.

If just some JavaScript files change, you don't need to redownload the entire Chromium blob.

You can still get delta updates with Sparkle in an electron app. I am using it, and liking it a lot more than Electron Updater so far: https://www.hydraulic.dev