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Can combine in it's current state completely replace RxSwift in a project? (disregarding compatability).

That's my question as well. Should I learn both technologies for greenfield projects or just use Combine?

Combine is only iOS-13 If you wanna support any OS before that you have to use RxSwift for that

I believe it does replace RxSwift other then some operators that the Combine doesn't have currently can be easily added.