alt Hacker NewsIt is _the_ 2FA device. from SMS, to authenticators, to password managers, etc. It also has access to all of your personal information, your pictures, your contacts, your email. It actively receives notifications and messages from the outside world, from potentially any sender. It's connected through WiFi, GPS, 5G, bluetooth, UWB, every possible connection system imaginable. It can listen to your phone calls, read your text messages, interact on your behalf with pretty much everything in your life, and is a single facial recognition away from automating emptying your bank account. Not to mention the fact that mobile software does tend to want to at least survive a little bit when offline, so plenty of data is stored locally.
It's a key to your life. The perfect target for any attacker.
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You just described a computer. There is nothing in your list that is mobile specific.
My Linux laptop is my 2FA device (email), it holds my passwords, and personal data like photos, contacts, email. It receives notifications and messages from outside world from potentially any sender. It connects through Wi-Fi, Bluetooth, Ethernet, 5G (built in WWAN). It even has cameras, microphones and I use it for my online banking and shopping. The only reason why smartphones "need" to be ultra secure is because everyone and their mother have one and the truth is most people can hardly tell a difference between their head and their butt.