I’ve identified another use case @ptpaterson:
We have a questionnaire where we ask the user hundreds of questions. Based on that, we want to extract master data that should be updated once something changes in the Questionnaire collection. The master data is like a big nested object inside the Organization collection. With the option to have computed fields in structs, we could create the master data to be fully reactive based on the questionnaire data.
We would combine the computed field with a self-introduced formula field that can store custom functions and will be called from the computed field (See our discussion about the useFormula function) - With that, we would get a fully reactive database - game-changing.