JesusGreen
Posting Mad!
In principle I like the feature but currently they can't replace my existing end card plus you disable all annotations (even before the end card) when you use it.
My hopes are that they plan to upgrade the end card system into a full replacement for annotations (not just at the end of the video). Annotations still look like something from 2006 YouTube and have been outdated for a while, they could use a clean fresh update.
It'd be a good way to kill several birds with one stone: Allowing annotations to work on mobile, upgrading the visual appearance of annotations, and allowing them to work alongside the end screen stuff.