I am a +1 on celebrating achievements when they are one.
2+ years to migrate part of an app to #React Native, for example, is not one of them: https://shopify.engineering/migrating-our-largest-mobile-app-to-react-native.
It is a perfect example of the #CADT-model (https://www.jwz.org/doc/cadt.html): people rewrite because fixing it is not fun.