I also felt the whoa when I tried Swift, so I know what you mean!
It's never wrong to check out other langs. Especially in Frontend, I think it's important to know other means of developing interfaces. There are lots of out there: Qt, JavaFX, Immediate-mode GUI vs. Retained, React Native, VB, iOS Constraint-Layouts, Unity-UI etc.
It gives you a broader perspective and maybe some appreciation for Frontend-Dev.
Career-wise keep in mind that the iOS-Platform also has C#, and I'm not sure if you can go Swift-Only just yet in that environment, since lots of apps out there are still not using it.
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