I'm working with a team that's in the process of decomissioning a previous teams attempt at ES. Even the new team wanted to do ES, whilst staring at the remains

I'm working with a team that's in the process of decomissioning a previous teams attempt at ES. Even the new team wanted to do ES, whilst staring at the remains of the previous attempt. Luckily they haven't. Usually arguments go "we need an audit log so ES is a natural fit and we'll be able to iterate quicker because we can just re-project when we get things wrong, oh and testing is really straightforward too because we can just...". You can have an audit log without ES. You're also going to hate versioning events. And navigating your tangled nest of events that you accidentally accumulated in the name of agile isn't the nirvana you were hoping for. I believe it's better to have a system that responds to the requirements of here and now, leaving history behind, learning from mistakes going forward and accepting that yesterday is done. In my experience, in growing software systems, you're more likely to have not to have even had the data/event at all, than to not have misappreciated what you already had. So event logs feel more like a bunch of baggage ready to trip teams up than a wealth of value.