That's a fair question, to be honest I just want the extra speed. I really did notice the difference when I got my 2nd 970 evo a while back and put them in raid0. Those are now running in a different system, so I need a replacement for them. Running PCIE 4.0 SSD's in raid0 would be a nice upgrade.
As for the build I'm doing now, I want to make a "No Compromises" small PC build, in which such an, admittedly, overkill storage solution would fit nicely.
Also, about the data loss argument: I have my own 24TB Raid5 array, accessible to my local network, where I back up my files regularly, so data loss isn't really a big argument.