For many people, there is no need to remove nails without changing them. Actually it will be bad for a long term.
Why need we remove the nail? The first is ugliness. Nails are designed to look good, but when they get longer, they become less attractive and even uglier. Moreover, after a long time, it is inevitable to bump up and fall. There will be a gap between nail and nail oil glue. And it's not easy to clean, which bacteria love. It is common for nails to turn green or yellow.
Nail drill machine is faster and more efficient, which could polish nail oil glue off directly.