Noone use electrum on android??
Because it Python dependencies are needed for Electrum and most of the newbies go for simpler methods. Click 'Play Store' -> Search 'Bitcoin wallet' -> Install.
In my view, android is not a very safe platform for a wallet unless the android system has nothing installed and will not be used for anything other than storing bitcoin.
Yes you are right, you should "keep" a clean android smartphone only as wallet for your bitcoin, it is not suggested to download other apps or visiting suspicious link (from that android smartphone)
You can save your android by 90% if you check permissions. You can easily understand for most of the apps, whether it is good or not if you check permissions.
-MZ