(1) From the perception of most people, mainstream filesystems such as ext4 and NTFS are pretty reliable. I've certainly had mainstream filesystems get damaged but I've been able to repair them or copy data off without a lot of trouble.
One reason mainstream filesystems are reliable is that they privilege reliability over performance.
(2) In my experience, new file systems are dangerous. I've pretty frequently experienced data corruptions within a few days of trying a new file system. I've frequently been on projects that tried the latest thing, like the Linux filesystem that was written by a murderer, and after experiencing problems, we've gone back to mainstream file systems.
(3) New file system advocates believe filesystems and disks are unreliable, so they're willing to tolerate a higher level of failures.
(4) Most terrifying, look at all the discussion on this thread about options you can choose that might mitigate this problem or that problem. Every configuration choice is a decision you can make wrong, is a reason why your system can wreck in the middle of the night. If you know your stuff or hire somebody who knows his stuff, maybe you'll get good choices, otherwise you are playing Russian Roulette with Vladimir Putin.
