It would be interesting to see counterproofs to the claim that "other people who use this device won't see your activity". They might not see it in Chrome, but what if I search pregnancy tests and then another user of the same device sees Google Ads for pregnancy tests, or for baby products? They'll reasonably infer someone was looking for them and this might put lives in danger.
The example is not theoretical: https://www.ftc.gov/news-events/blogs/business-blog/2021/01/...