Having the ability to pass multiple parameters onto a reusable element would allow us to build really powerful reusables. Custom states are already a way for elements to communicate with the page, but having no option to use dynamic data on them is a really limiting factor.
For now, there are ways to work around it, as described on this excellent topic:
But these ways are not the ideal as they can be really hard to keep organized.
Allowing builders to send multiple parameters to a reusable element would be a huge step towards even more modularity and flexible reusability.