[est31]

A 95% chromium world is the same as a 95% chrome world in many regards.

Following Chromium upstream is an extremely hard effort if you have done any kind of non trivial changes to it. There are constant refactors and changes. This means that your chromium using browser can't be anything more than just a reskin of Chrome, which means that you don't have the agency to support some feature that Chrome chose to not support, and the features you do support are likely going to be implemented 100% the same due to using the same code, including the bugs. This leads to the same "code assuming the bug" issues that if everyone used Chrome.

Furthermore, Google has a monopoly on Chromium developers, with only few people contributing from the outside. Your Chrome reskin team will likely be very skilled in maintaining a Chrome reskin but if Google ever decided to stop the Chromium project in favour of a closed source Chrome, there would be nobody who knows how to properly maintain the fork going forward, neither at your company, or available for hire.

You are 100% at the mercy of Google if you do a Chrome reskin.