They survived several rounds of cost-cutting at a large company by constantly convincing management to let them rewrite their mobile app in some new framework because of X.
Start out with the native implementations, then they did Xamarin, tried PhoneGap, went back to native, then to React Native, and now on to Flutter. The pair of them keep their jobs constantly rewriting an app.
And if the UI/UX does not significantly change every 6 months, your users will give you one star reviews and "Old looking and ugly" comments. I don't envy app developers.
That's a very dangerous career path though. If that legacy system gets replaced you are usually out of a job and job search is hard with outdated skills.
Also, problem solving and creative thinking are never outdated skills. ;-)