I know that you know it, I was talking about your hypothetical user.
Except for the color of the icon and the lack of support by default for AAC, H.264 and MP3 (I have support for those 3 in Chromium in Arch), do you find anything relevant that will make some non-expert notice they are using Chromium and not Chrome?
I assume you haven't used Chromium. It's not an issue, as I said they don't come by default as in Chrome, but those codecs are easily installable through the package manager.
I hadn't even noticed Chromium doesn't have support by default for those codecs as I have used HTML5 audio and video without an issue. Really, for a non-expert Chromium is just Chrome with a blue icon.
Except for the color of the icon and the lack of support by default for AAC, H.264 and MP3 (I have support for those 3 in Chromium in Arch), do you find anything relevant that will make some non-expert notice they are using Chromium and not Chrome?