There are too many apps tied to some real-world thing that only support iOS and Android. Consider banking apps for mobile check deposit, or apps that let you remote start your car. And even if you were willing to go without those conveniences, consider the SeatGeek app. I've been to shows where the only way to get tickets was with that app - there was no paper option and no Web option. And even though emulators like Waydroid exist, a lot of those kinds of apps implement things like SafetyNet or Play Integrity, basically to intentionally refuse to work in any environment not officially blessed by Google.