Yes, I am. Apple is too:
https://blog.timac.org/2022/1005-state-of-swift-and-swiftui-...
In my estimation, these are the primary reasons why some developers continue to use Objective-C:
1) Rewriting an existing code base is almost always massively expensive and dangerous.
2) 9 years later, the Swift tooling is still atrocious. Compile times are much longer, the compiler still crashes, the debugger still doesn't work reliably. It's a major step down from the mature Objective-C tooling.
3) There are still land mines with interoperability between Swift code and Apple's underlying Objective-C frameworks. Performance bottlenecks, unexpected object bridging issues, erroneous nullability annotations, etc.
4) C and C++ compatibility, as mentioned by another commenter.