Scholar doesn't need the Cure Spell, but I have it, due to the same reason any SCH would have, better animation. It seems like the Cure animation speed is a hair faster than Psychick itself, which I prefer it over our standard spell. Some would argue the animation speed but its personal choice, I find that the Cure spell saves me during lag spikes. Simply because I'm not holding my arm up waiting to cast it. Also Scholar is better suited in dungeons since we can Ress as soon as someone goes down in combat, but people will sadly prefer a White Mage over us, forgetting that we have the ability to pick people up mid-combat during the action while a WHM has to wait until combat ends.
Equipping a skill you already have reduces the amount of cross skills you can have. So now instead of having a space for protect and stonskin and swiftcast, you now lose one of those to have a (second)cure which you already "had".