Aww, yeah that makes sense.
I keep getting stuck on the fact that a single (or RAID 1) drive (winchester) itself is so slow, so easy to saturate its throughput that is almost seems useless today. Of course this could be expanded out to then say, well if RAID 1 is useless, then RAID 5, 6, etc are even more so.
Please don't take that to be me saying RAID 1 is useless, of course it's not. Using RAID 1 for work loads that don't need a ton of storage or throughput, RAID 1 is great.