This seems like the right call for UX. I don't like that it takes up vertical space that could be content. But on scrollable content with controls, I often end up with this exact kind of affordance. In fact, I noticed recently that on this site I was doing a lot of scrolling to find reaction buttons. And sometimes I would forget to react because the buttons were not handy. This helps me to remember to react.
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This seems like the right call for UX. I don't like that it takes up vertical space that could be content. But on scrollable content with controls, I often end up with this exact kind of affordance. In fact, I noticed recently that on this site I was doing a lot of scrolling to find reaction buttons. And sometimes I would forget to react because the buttons were not handy. This helps me to remember to react.