the reason why people say its not allowed is because it attracts attention, attracting atatntion means it gets make attention, in another you're maing yourself appeal to the opposite sex, (people who you dont know).
howver if you follow this then basically any means of fashion or even day to day grooming can be passed off as being disallowed, such as cutting and styling hair ins ucha fashion that it draws attention, wearing makeup to amke yourself looke more attractive wearing clothes that define your body, shoes ect...
hence wearing nailpolish is allowed, but you have to ensure that the environment you live or work in means that doing such a thing doesnt generate attention from unaquainted males in another words dont wear it if the sole purpose is ti get another guys attention...
so back to my original point, yes you can wear it but for me it isnt ideal as it causes probelms with doing wudu, as once you coat your nails you cannot wash the nails properly, thus u need to remove the nailpolish before doing wudu, now considering the amount fo times an avergae individual is likely to break their wudu naturally ie through going to the toilet it would get extremely annoying fi you had to keep removing and then reapplying it like 3-5 times a day.
hope that helps!
x