It would be so beneficial to have the possibility to link and (real-time) synchronize the same slide in different presentations. Thus, when you update the content of this slide in one presentation it automatically updates this exact slide in all linked presentations.

Especially when you have the same slides in several presentation within a company this might help to maintain data consistency.
This will save a lot of effort and avoid cross-checking as well as enable you to have a single source of truth.

Maybe offering a “copy and paste” feature, being able to choose either to link the slides or handle them independently. Also it would be great to have some sort of push-up notification when slide was automatically updated.