You cannot match the features or usability of iOS with anything open-source. Full stop. It's not even a comparison.
Sure, if you're so laser-focused on privacy that you want some obscure phone which will do nothing aside from text, call, and send Signal messages, go buy the weirdest one you can find. otherwise you won't be finding anything remotely enjoyable if it's not iOS or a major android flagship. And out of those options, only one respects the user's privacy and security.
Sure, if you're so laser-focused on privacy that you want some obscure phone which will do nothing aside from text, call, and send Signal messages, go buy the weirdest one you can find. otherwise you won't be finding anything remotely enjoyable if it's not iOS or a major android flagship. And out of those options, only one respects the user's privacy and security.