There is a special kind of crazy which applies to developers who get excited about migrating older, legacy applications to newer, more supportable platforms. Some of us wear that badge proudly. Just like a total renovation can transform a house into an entirely new experience, upgrading your existing web or mobile applications will not only offer the chance for your users to genuinely enjoy your products, but any developers working on your applications in the future will love you for it. The hidden cost of technical debt is very risky to let accumulate. Just like with any kind of debt, paying down the interest AND the premium must be done eventually, or risk defaulting on the debt.