It's probably obsolete by now (I'm not so sure in that department..) since Linux FS are usually robust. (I use F2FS and never have corrupted data caused by a crash.)

If you have changed your FStab (adding noatime) or remove journaling, data has a higher chance of corruption.

Looking at Magic-SysRq, it looks like commands the kernel does that's useful for hang states (Unless a complete lockup occurs). I've never even heard of this, just letting the kernel managed the hang or use the power button.

I don't exactly know how your distro handles these (Or if you are using an experimental distro), but Debian Sid handles crashes exceptionally well. I have used Manjaro, but bugs (audio, lockups) have happened while in use.

Have you checked if it's even working? Take a look here to find out what exactly is it and see if it even works as intended.

Hopefully this is helpful to your troubles. Have a good day.