I am not so sure they really care about changing their search. They only recently started to change their recommendation stack, after years of using outdated t

I am not so sure they really care about changing their search. They only recently started to change their recommendation stack, after years of using outdated technologies. I think it is somewhat similar with search. It's not so much that "it's complicated at their scale" as "It works somewhat okay, which translates into X hundreds of millions of $, so don't touch it". I know they could (and they most probably do) run A/B tests, but the thing is, how do you run MVT tests on such a large infrastructure, with such a varied catalog, etc...it all gets very complicated at their scale, just from an org perspective. Many "power users" complain about the state of Amazon search, but I doubt the average joe really cares about that. A more recent (and with a much smaller catalog) player, zalando (rocket internet) has a modular org and a modular approach to their stacks and they, apparently, change or update their tools much more often than Amazon. I am pretty sure zalando being more "agile" come from their much smaller size (both in inventory, turnover and org). Large organisations have a harder time moving than smaller ones, after all...