In 4.1 we added the Curves
view, where you can save curve presets. Since the ease in and out buttons duplicate the curves view presets, we thought it best to reduce the number of buttons in the graph toolbar, which has quite a few. You can configure the curves view to show only the presets, if you don't have much space on your screen:
Loading Image
It was sort of a test to see if anyone notices
you are the first one to mention it. We could bring them back, maybe they appear only when there is enough room to display everything in one row of toolbar buttons. Though using the curves view presets allows you to customize the ease in and out presets.