Earlier quoted context omitted.
How is Postmarket OS antiquated ? Its just a standard Linux distro (unlike anything Android based).
At least in regards to the security model, it is decades out of date. For example any app can listen to your microphone and spy on you at anytime. Programs can act as ransomeware or destroy all of your files. Stealers can steal your login credentials and access tokens for all your sites including banking ones.
Frankly, I still trust this model much more than black box Android apps automatically updating in the background, sending tons of telemetry and demanding random permissions so they can spy on you.
Not to mention the security model preventing many useful things from working properly (try to get a SFTP working on an Android system so that you can copy out photos taken by the phones camera.