This actually is something that could be really helpful, depending on the player.
I'm often switching out enchants depending on the situation, and I keep a pretty large number of them on hand, so it'd help to be able to look at both the one I'm pointing at, and the one I have equipped at the same time, particularly as my short-term memory is really awful; I'll often look at the one I have on already, then I'll go look at the one I might switch to, but by then I've forgotten what the stats for the already-on one is, and.... yeah, this becomes a rather stupid loop sometimes.