100% agree. I used it for position management software in equities and it fit like a glove. Effectively, we had a stream of transactions coming from upstream th

100% agree. I used it for position management software in equities and it fit like a glove. Effectively, we had a stream of transactions coming from upstream that we aggregated into a cache. Being able to replay events, or step through to figure out why something had gone wrong was terrific. I then tried to apply this to a conventional request-response web service. It did not fit well. Everything was immediately significantly harder with only a marginal gain. My rule fo thumb now is to use event sourcing when doing otherwise would be difficult. A justification based off of an improvement, rather than one solving an obvious problem, isn't worth the extra effort.