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.