The edit command prevents Editing an existing contact due to the a person with the same name existing in the data book, even though two people named John can be different people as they have different phone numbers, etc.
However, as having a same name is very common, this limits the functionality of the app, as the user would have to find different ways to distinguish people such as by adding their full name. In the worst case where the legal name is exactly the same, the user might even have to find other ways such as by adding junk values to maintain the contact, e.g. John--.
The edit command prevents Editing an existing contact due to the a person with the same name existing in the data book, even though two people named John can be different people as they have different phone numbers, etc. However, as having a same name is very common, this limits the functionality of the app, as the user would have to find different ways to distinguish people such as by adding their full name. In the worst case where the legal name is exactly the same, the user might even have to find other ways such as by adding junk values to maintain the contact, e.g. John--.