Linux OS is also very capable of surviving a power cut, but the Raspberry (arm? SDcard?) can't very well - I can crash my regular PC with linux as often as I wish without a recovery problem.
If I do the same on my ARM OpenWRT USB stick router, it will destroy the whole partition table 50% of the time. If I do the same on my Raspberry, it will corrupt files of the filesystem 25-50% of the time... So there must be something to fix there too
Indeed. I think my "extreme usage" problem is not so extreme at all. I can guarantee that everyone faces sometimes a power-out or must just turn off power when the OS has freezed. It would be really nasty to loose all data & installed programs & settings. I as well have taken power off on hard disk OS machines without worries and never faced this kind of unreliability.
I also know that SD saves data in "chunks" (512 bytes?) so that definely can cause problems when the power goes out while unwritten chunk or so.
I also don't believe that good solution would be "try some other SD card". If that is so, I think there should be a suggested card that everyone should buy to avoid these problems. If this problem is avoidable in this file system & SD card combination.
I've decided to put RPi aside and wait for better days, I'm sure that this is a problem that should be fixed somehow. I cannot do it, but I truly hope someone from the community can fix it. Or tell how to avoid the problem so that I can rely that my synth's OS goes up just before gig..