That's why we write tests before refactoring a piece of code. That way we can be reasonably sure the new code is not critically broken after the refactor even if there are things in the old code that we don't understand.
Plus, we are able to deploy the new code to production quickly and the users start using it, so if we missed anything or changed some behaviour, we will get feedback on that quickly. If you do a rewrite of the entire application before your users start using it, how long will it take until you realize you missed something?
I get the impression that you are more confident in doing a whole rewrite than refactoring bit by bit, but I wonder why that is. If you don't feel confident to refactor an area of the code because you don't know what a variable does (that's what I understand you are saying in your comment, please correct me if I'm wrong), why do you feel confident you can write a whole new application that will fulfill all the requirements of the old one?
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That's why we write tests before refactoring a piece of code. That way we can be reasonably sure the new code is not critically broken after the refactor even if there are things in the old code that we don't understand.
Plus, we are able to deploy the new code to production quickly and the users start using it, so if we missed anything or changed some behaviour, we will get feedback on that quickly. If you do a rewrite of the entire application before your users start using it, how long will it take until you realize you missed something?
I get the impression that you are more confident in doing a whole rewrite than refactoring bit by bit, but I wonder why that is. If you don't feel confident to refactor an area of the code because you don't know what a variable does (that's what I understand you are saying in your comment, please correct me if I'm wrong), why do you feel confident you can write a whole new application that will fulfill all the requirements of the old one?