Prompted by Embedding third party JS Tracking for my site
In some cases you just need to embed a script on your site. Yes, you could do it via a "Core - Custom Code" action but I also wonder if it warrants a "Generic Embed" extension. If the provider of the script is a small company who will likely never create/maintain an extension, it would be nice to still have an easy way to add the embed code. In this case, you likely don't care about it providing any configuration, rule component types or data elements so a generic embed is probably what you are after.