Hello Christina Rothwell ,
Thank you for your idea.

One of the benefits of Tridion Docs our customers value, is that it stores and delivers the same content (having a single source of truth) in different languages through various channels.

This is to make sure that content consumers will receive the same message across all channels.
A use case shared in the idea can be achieved by creating separate publications or publication versions to serve different output types.

As Dave De Meyer commented above is it possible to share the use case for this idea?
What are the content differences between different output types? What drives the uniqueness of the content per output?
Thank you.

this is a completely great feature, nice work

hills of steel

Nice idea bro. Good job!

Great. Thank you for this idea.

retro bowl

Thank you for this idea... could whoever is interested in this idea share a couple of examples of what kind of content you are driving with conditions on the output level. So what type of content needs to be 'unique' for an output and not for the complete version of the publication?