Lots of hype about event sourcing and CQRS, usually in combination. 99% won't need it. Has the potential to ruin your team and even company unless you have a well-above-average engineering team.
One of my unwritten requirements for any system is being able to drop in inexperienced devs for maintenance...after I leave. Most people are likely to shoot themselves in the foot by not understanding (or even being aware of) database isolation levels much less grokking an event pipeline.