I started daily driving a PinePhone with Mobian over two years ago, upgraded to a PinePhonePro when they first came out, and then I finally got my Librem5 about a month ago. They have come a long way. The core functions you’d expect from a phone work; calls, texts (SMS and MMS), camera (pictures and video), email, web browsing, all that works perfectly fine on my Librem5. However, I understand they are not for everyone. While there are things like twitter and mastodon clients for Linux you are not going to get a banking app for a Linux phone (for example). I just use the browser for those kinds of things though.