There is absolutely nothing wrong with code that has been, and is delivering value in production.
Are you sure? Why is it "nothing wrong"? It could be like this or it could be just brilliant and it could be very wrong and be working with enormous effort of support people and developers that inherited it. This cannot be justified by the fact it is delivering value because the costs of maintenance for this code could just be too high. It can also create impediments for further development of the business since it is, for example, hard or impossible to change.
So, how all this makes it "nothing wrong", is it just because you want to show your respect to the people who wrote it? You can respect them and still point out that the code is wrong and must be fixed, otherwise the business is badly hurt.
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Are you sure? Why is it "nothing wrong"? It could be like this or it could be just brilliant and it could be very wrong and be working with enormous effort of support people and developers that inherited it. This cannot be justified by the fact it is delivering value because the costs of maintenance for this code could just be too high. It can also create impediments for further development of the business since it is, for example, hard or impossible to change.
So, how all this makes it "nothing wrong", is it just because you want to show your respect to the people who wrote it? You can respect them and still point out that the code is wrong and must be fixed, otherwise the business is badly hurt.