kapa.ai Your recommendation to use the client-side SDK-to-SDK method as a 'best option' completely ignores the realities of the iOS App Tracking Transparency (ATT) framework.
In a production React Native environment, if we implement this SDK-to-SDK method to pause or buffer client-side analytics events until the Singular callback resolves, we expose the app to massive data loss and a broken user experience. On iOS, the Singular SDK can wait up to 300 seconds for the user to interact with the mandatory ATT permission prompt.
If a user launches the app, stares at the ATT prompt, completes an onboarding action, and backgrounds or kills the app before interacting with the prompt, your suggested client-side queue will either permanently lock up the React Native component mounting loop or drop critical early events (App Launch, Login Completed) entirely.
Explain why you are recommending a high-risk, client-side blocking implementation that causes data drop-offs during ATT latency, instead of prioritizing Solution 1 (Property Backfilling via Last Step Defined), which allows natural, non-blocking client execution while letting Mixpanel's query engine handle the out-of-order S2S data latency cleanly at runtime.