Mature and old are not the same thing. I don&#x27;t think TkInter is stronger than React +Electron for building stable, large apps despite the large age difference.<p>One thing is that React is the newest iteration of production-quality declarative UI management. Angular, Backbone, a lot of stuff came bdfore. And all that contributes to a mature understanding<p>That being said, I forgot about QT quick. That is also pretty powerful stuff. Though the web influence seems there ( correct me if the causality is wrong).