Often times, as bad as it sounds, the business value is forgotten by developers who criticize these systems. Like these systems are already in place, it would be an unrealistic undertaking to exchange them with "less complex" systems. Businesses unfortunately have to make money, rebuilding something they heavily rely on is not something they can just do (Part of why so many corps are vendorlocked by SAP). Also, where are the less complex systems? I did not see anything as flexible and easy as web tech. Even though it pains me how unsafe it is.