Over the past few years, Google has done a great deal of work to implement useful features into stock Android. Specifically, we're referring to features that existed in skinned versions of Android, for example EMUI or TouchWiz. Such features like the blue-light filter, dual-windowed apps, and always-on display were all implemented on manufacturer skins before making it to Google's vision of Android. One feature that we might not see on the Google Pixel for the foreseeable future is the "scrolling screenshot". Implemented in many other Android skins, the scrollable screenshot lets you take...
Source: https://www.gsmarena.com/stock_android_wont_have_a_native_scrollable_screenshot_feature-news-36816.php