I tried this briefly on a pine phone ~2 years ago as I was going through the different options trying to see if there was something viable. It was useless then, the phone barely worked, and I’m pretty low maintenance, I basically just wanted mobile date, wifi, email, and browser. I don’t really remember sailfish specifically as I was quickly cycling thought the options but I know I tried it and found it unsuitable.
P.S. unless there is a sailfish browser that ships separately with a different OS and I’m remembering that.
P.P.S. I would love a Linux phone that lets me take calls and has mobile data, wifi, web browsing and GPS/navigation. I don’t care about apps other than navigation. AFAIK there is not currently something that fits the bill and works out of the box.