(Author here) TBH I don't think the main goal of Google was to make bots undetectable. It was more a side effect of preventing side effects while reviewing errors in the devtools:
https://source.chromium.org/chromium/_/chromium/v8/v8/+/e08e...It was the same when Google released the new headless Chrome a few years ago: https://antoinevastel.com/bot%20detection/2023/02/19/new-hea...
It made vanilla/naive bots more realistic/detectable by default.
