IMO that's mostly because people try to wrap APIs that work just work differently under a single Interface. If there was an "AndroidNotifications" package for that, that just exposes that API 1:1 in Dart, it would be almost as easy as in native code.

I published a blog on, Notification Services in Android O and above. #Android #AndroidDev #AndroidNotifications #Java link.medium.com/e6TwlHbmP5

How to mirror #AndroidNotifications on #Windows10 with ‘Your Phone’ app - hubs.ly/H0jFqPg0 @NexusBen #AndroidNews #AndroidTips @Android @androidandme @Androidheadline @AndroidPolice @androidappsrevw @androidtnh @androidtapp @TalkAndroid @TheAndroidSite @droidappstorm

#Windows10 start showing #Androidnotifications #WindowsOS #Windows #Microsoft #MyPhoneapp #Android #Update #Notification #Google geekboots.com/news/windows-1…

Tame your #AndroidNotifications with these 5 #tips and #tricks - hubs.ly/H0hd7n60 #AndroidTips #AndroidTricks @derekmross @GhabranaNahiiHy

Customize Notification Snooze Duration on Android 8.1 Oreo without Root droidviews.com/customize-not… #Android8.1Oreo #AndroidNotifications #TipsandTricks via @DroidViews

Get Android Oreo droidviews.com/get-android-o… #AndroidApps #AndroidNotifications #AndroidOreo #NotificationApps #TipsandTricks via @DroidViews

That took some time ... #AndroidNotifications #UnityPlugin #GameDev #IndieDev #MadeWithUnity

Just Posted : Notifications — Part1 : Styling : goo.gl/QHA9jM #Android #AndroidDev #AndroidNotifications #AndroidAcademyTLV

#android #opensource #sourcecode #androidnotifications #code #source #androidsamples #androidproject #codemeright bit.ly/1VBnBlM

#Androidnotifications are richer, better designed and actionable. #mobilefirst #appdesign #appux #mobiledesign #

Finally Android notifications at my #Jolla are working. Thanks to @iCODeRUS #AndroidNotifications #Openrepos