Native vs Flutter/React Native/Xamarin, Dropbox going full Native

https://blogs.dropbox.com/tech/2019/08/the-not-so-hidden-cost-of-sharing-code-between-ios-and-android/

https://www.reddit.com/r/programming/comments/cqe90r/the_not_so_hidden_cost_of_sharing_code_between/
-- has good discussions about Flutter, React Native, Xamarin
https://www.reddit.com/r/programming/comments/crunfh/dropbox_would_rather_write_code_twice_than_try_to/