It's the best way to build React Native apps, with very few exceptions, these days. (I have been building RN apps of all types since it came out in 2015.)
Someone pointed this out to me on Twitter this morning and it's an aspect I didn't even think about. Most third-party SDKs have a JS version which generally (not always) works with React Native. Can't really say the same for Dart, so you're almost always doing a native integration or building it yourself.
I used to recommend unroll.me to people but eventually found that relentlessly unsubscribing from things worked better anyway. I assumed they were making money from ads, but should have known better.
I have a few simple rules I follow to hit inbox zero...works quite well:
1. Unsubscribe Relentlessly
2. Use Keyboard Shortcuts or Gestures
3. Snooze Important Emails
4. Use a To-Do App