The rewrite is better! For the engineers who are planning to have a new job in a year. They get a whole year of being able to deflect all questions about how far behind schedule we are and how many of the customers want to burn the building down.
It's a great gig if you can get it. Horrible for the users and investors, of course, but great for the engineers.
Why on earth do we need this thing here?
Oh, that's why.