IMO this makes the argument for ChromiumOS and downstreams stronger. Gemini wants to do everything in my browser and i can't turn it off please help

The OS on these Googlebooks will probably be a lot closer to Android 17 than to current ChromiumOS. Google has been consistent in saying that they're phasing out the ChromiumOS code base (while continuing the support the Chromebooks they've already sold) in favor of modifying AOSP to work better on laptops and desktops.