I’ve noticed a lot of Indian women do this at work so I asked one of them why are here's the answer I got. It has less to do with convenience and more to do with safety. Most Indians eat every meal with the hands and will ALWAYS use only their right hand. Nailpolish contains chemicals which you risk ingesting if your nailpolish chips while you're eating. Also, eating food with long nails can get messy. Hence the right hand has short and nailpolish free nails.

But these women don't want to miss out on the beauty & fun of nail polish which is why it's applied on the left hand. Long nails are fun too.