There's a lot of overhead from disk seeks that plague a lot of traditional databases. Especially if you have a physical arm moving around. Any database like t

There's a lot of overhead from disk seeks that plague a lot of traditional databases. Especially if you have a physical arm moving around. Any database like this that can write data sequentially and forgo update and delete operations can really speed things up. Also at scale you start worrying about things like storage costs. Sequential reads/writes make it reasonable to use spinning disks for the cost savings as SSDs cost more and lose their order-of-magnitude advantage when comparing sequential writes.