And i'd like to mention many chromebook have only 4GB RAM and eMMC storage which is rather slow which isn't much different with Raspberry Pi 4.
On phones, I see Android as a necessary evil. I see no point in using a Chromebook, I've never used it and I imagine they're loaded with ads and Google's spyware. I'm not sure if that's true though, but I have no reason to find out.
While i agree with you, unfortunately Chromebook gaining popularity on low-end/cheap laptop category. Although unlike Android, some chromebook
currently let you install different OS with no or little hurdle.