I think use/time of the code needs to be factored in as the more the code is used, the more bugs are exposed and fixed, such that old actively managed code can

I think use/time of the code needs to be factored in as the more the code is used, the more bugs are exposed and fixed, such that old actively managed code can be far less buggy (if all goes well and the architecture is good). Less code that does the same job is always better.