A binary format that is only readable by some very specific version of the program writing it. The older xls comes to mind, but there must be thousands of examples.
Lots of sites publish outages, incidents, downtime over RSS/atom. Works great for monitoring, post them into slack with a bot and you can start a discussion thread about that incident where you first hear about it.
The curl alias in powershell is not compatible so it is an inconvenience. Must be one of the worst decisions to make it into windows, which is saying a lot.
Also you can schedule it a bit off. Every hour? Delay it a few seconds. Can’t do that with a chat message. Also, batch up a bunch of them, maybe save some compute that way? Latency is not an issue.
I honestly don’t think the models are as important as people tend to believe. More important is how the models are given tools - find, grep, git, test runners, …