speaking of Elasticache -- I noticed that the "append-only file/AOF" feature for recovering from crashes/reboots is only available on AWS redis up to version 2.8.22, and we're now at like redis version 7 in the rest of the world..
I'm convinced that, too, is disabled deliberately, in order to coerce you into buying one more overpriced Elasticache instance to use as fail-over. This type of "funneling" design pattern is recurring across their managed products.