We use the main event as a blueprint of what all sources for the app should follow as event variants. Some variants don't have properties from the blueprint for a number of possible reasons:

Does not exist on platform with no plan to implement

Not yet implemented on the platform

Technical limitation to include on this platform

etc.

If whenever a user hovers over the red strikethrough properties on an event variant the reason for its exclusion pops up or is otherwise visible, this would be really helpful to know what the status of the exclusion is for that property.