I would also like to chime in as a long time (20+ years?) user of JFS. I use JFS for essentially all my Linux boxes, laptops, desktops due to its low resource usage and proven dependability. I also really enjoy its "naive" implementation of case-insensitivity, which I tend to use on /home mounted filesystems. I would really miss JFS for what it's worth and would like to sing its praises: low resource usage, tried-and-tested stability and for a long time the only case-insensitive option available (I know about ext4's new case-folding features of course, but have not had good experiences with it yet (experienced boot issues with grub, per directory setting)). Kind regards, Rubin!