Can you re-architect the product from scratch? This should be doable if the raw building blocks (modules etc.) are properly designed and easily incorporated into a new design. If this is not the case, then all the more reason to rewrite the code!
I wonder, did they really rewrite or refactor. Did they chuck out every single last line of code at once, or transitioned it slowly? Do they no legacy code left at all?
Read carefully: I said only rewrite if the code structure is bad. If the code structure is good, then re-architecting can amount to restructuring only the top-level parts.
It can give OP a better feel for how the code is designed, and give them more opportunity to change things in a more structured way in the long term by repeating the process (rather than just fighting fires every time).
