Paying in terms of write units adds so much complexity to what would otherwise be dead simple code. Normally, you just write to a data store until it's done. T

Paying in terms of write units adds so much complexity to what would otherwise be dead simple code. Normally, you just write to a data store until it's done. The faster the disks the less time it takes. Now, writes can "fail" so you need to wait/retry or put it back on a queue to reprocess when you have write units available (both of those and the associated logging will cost you $ on AWS).