[unregistereddev]

I agree. New codebases are clean because they don't have all the warts of accumulated edge cases.

If the new codebase is messy because the team is moving fast as parent describes, that means the dev team is doing sloppy work in order to move fast. That type of speed is very short lived, because it's a lot harder to add 100 bugfixes to an already-messy codebase.