My wife also has an XA2 with Sailfish, and I am quite impressed by the Android App Support. She uses the Signal messenger and Öffi daily, and also sometimes plays games, uses vocabulary learning apps and much more. Since a year or so it is in a state where we are surprised if an app does not work.

Maybe you should do a full reflash if your phone is so stubborn, somewhere something may have gone wrong.

For Netflix I can't help you, because she would not touch streaming services with a stick. But my guess would be, it just works.

Just as deutch1976 confirmed.