The lower wire amperage, and fire safety where my major reasons for choosing such a system. DC and high power is dangerous when compared to similar power in AC systems.

I’m also one of those people that like to see what the individual panel is doing and logging the data

While redundancy in a drive setup helps, it’s not really a backup and thus not a “safe” way to store important information on it’s own.

That said, selecting the way you setup a raid system is based on risk and utility. I have a raid1 with a hotspare for important files. And use raid5 with 3&4 drives for less important stuff. You can also optimise for reading speed for example (as the same file can be drawn from multiple drives)