Low security should use passwords. None of that fancy &@73gdb-Whb stuff. Just a regular word. Suitable for Netflix and meditation apps that want a basic login to prove that you paid.
Medium security should use magic links and a simple password that you don't need to write. If you lose your email, the password prevents hackers from taking over your app. If you lose your password, hackers can't take over your device. Suited for something like social media or MMOs, which are targeted very often.
High security might need proper 2FA with auth app, password rotation, stuff like that. Probably shouldn't be necessary unless there's constant active attempts to hack. Everyone gets attacked, especially in the era of AI, but I'm saying at least 10 attacks a day.
You can also layer on extra levels of security, but IMO that's about the level you should expect from users.