Are Firebase and GA useless for mobile app analytics?

Do I need Firebase and Google Analytics, or something else? Is what I'm currently using not enough?

I have a mobile application on iOS and Android. - I view Android data in Google Play Console. - I view iOS data in App Store Connect. - I track product metrics (events) in Amplitude. - I want to integrate AppsFlyer to track advertising sources (attribution).

Thank you in advance, I'm really stuck