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There's so many MIUI original features on this list lol
But I'd say in terms of Google definitely don't do 1 and definitely don't do 5. Auto updating apps is great. It saves time and energy but here's the thing about Google. Google Play is notorious for being unsafe so having your apps auto update when any one of those apps could be infected with malware is a very bad idea. I have no idea how new their app scanner feature is but it's still a Google version of our MIUI feature so I wouldn't put too much faith into it.
But 5 is for both Android users and even us MIUIers. Never auto join wifi networks except your own. And even your own you should be aware of the risks. It's long been established that hackers can use a thing called the pineapple and spoof your wifi ID which means they can trick your phone into auto connecting to them and then you are hacked. Just like that.