[anthonylevine]

I think having constantly changing product requirements would certainly make it difficult, but that makes all development more difficult.

In fact, I think most complexity I create or encounter is in response to trying to future-proof stuff I know will change.

I'm in healthcare. And it changes CONSTANTLY. Like, enormous, foundation changes yearly. But that doesn't mean there aren't portions of that domain that could benefit from event sourcing (and have long, established patterns like ADT feeds for instance).

One warning I often see supplied with event sourcing is not to base your entire system around it. Just the parts that make sense.

Blood pressure spiking, high temperature, weight loss, etc are all established concepts that could benefit from event sourcing. But that doesn't mean healthcare doesn't change or that it is a static field per se. There are certainly parts of my system that are CRUD and introducing event-sourcing would just make things complicated (like maintaining a list of pharmacies).

I think what's happening is that a lot of hype around the tech + people not understanding when to apply it is responsbile for what we're seeing, not that it's a bad pattern.

[simonw]

Thanks, this is a great comment. Love the observation that event sourcing only makes sense for parts of a system.

Could be that some of the bad experiences we hear about are from people applying it to fields like content management (I've been tempted to try it there) or applying it to whole systems rather than individual parts.

[anthonylevine]

No problem and likewise. Conversations like this are great because they constantly make me re-evaluate what I think/say and often times I'll come out of it with a different opinion.

> Could be that some of the bad experiences we hear about are from people applying it to fields like content management (I've been tempted to try it there) or applying it to whole systems rather than individual parts

Amen. And I think what most people miss is that it's really hard to do for domains you're just learning about. And I don't blame people for feeling frustrated.