I’ve used a Sony Xperia 10 III running Sailfish OS for a little over the last year. I’ve been a recent convert having used iOS before it. You’re right that it does have some notable bugs, including the ones you have listed above. For me I don’t use the camera for much so while the picture quality is really not good at all, it’s fine for me. I also haven’t experienced the echo issue, however I’ve heard people talk about it and I think Jolla officially recognize it as a bug. Excessive battery drain is another issue I have, I need to change daily more or less, it does use quite a bit more power in idle than android.

I haven’t really considered switching back because the benefits of sailfish out way the problems, I think a lot of people who care about the camera for example would not make the same judgement call. I find the platform relatively problem free for what I care about. I want a linux system which I can ssh into, have the tools I expect (bash, coreutils, systemd, cron daemon, etc.) and be able to run some linux software (some KDE apps, syncthing, command line tools, etc.). This is why I wanted this phone, for a linux distro. I also required some amount of android support for 2 apps which are applicable in sweden (banking), which works great for me. I’d lastly say the gesture based UI is really nice to use and I like it a lot.

I do wish it had a better camera, I wish they’d open source the propitiatory parts, etc. but it’s currently the best option for me. I think folks wanting to switch need to know what problems they’d accept and if Sailfish could be a good option for them.