How many different Android devices does a serious developer need to buy to ensure their app works well across the spectrum from the top end Android phones to the sub $100 Blu R1 phones?

How many different versions of the operating system do they need to support because of how soon Android phones are abandoned by the manufacturers?

But this still doesn’t answer the question, if PWAs are so great on Android, then why are the same companies who are making iOS apps making Android apps instead of just telling Android users to use the web version?