It doesn’t matter

Medium: “It surprised me to find that the vast majority of the apps in the top 100 are still building without any Swift.”

This shouldn’t be a surprise. In the end nobody cares what language you use to build your app, especially if it does what you want, performs well, and has a good design. 

Some may say I’m an old guy, so I shouldn’t be taken seriously. I will tell you this. If it ain’t broke, don’t fix it. That’s the proper attitude to have when developing software. I’m not saying you should never rewrite a section of code. On occasion that’s necessary, but if code works and doesn’t need to be touched as part of a new feature, just let it ride. You’ll be fine. 

In the end it just doesn’t matter.