VCV Unity was my least favorite built-in module. The intention was a no-nonsense alternative to stacking multiple cables on an input port, which is not possible for very good reason. Beginners were asking “Why can’t I combine CV by stacking cables on an input?” I would suggest VCV Unity, but it led to more confusion because it has a VU meter (which is designed for audio rather than CV), has two channels (but they only needed one!), and has an average switch (which confused people why it was decreasing the level simply when adding additional cables, which is the point of averaging).
VCV Mix fixes all these problems, as well as offering an adjustable gain parameter for free. The panel is as narrow as possible within our internal design guidelines, and two VCV Mix modules is the same width as one VCV Unity.
VCV VCA-2 was also deprecated/hidden and replaced with the single-channel VCV VCA (which now has an exponential “jumper” available in its right-click menu). Both VCA-2 and Unity are still available when loading old patches but are unavailable in the Module Browser.