Aside from the scripting language, a major innovation Decker has over HyperCard is the concept of "Contraptions": user-defined interactive widgets that can be reused by simply copying and pasting them between decks. If you can make a card, you can make a contraption, and then you can share it as a new building block:

https://itch.io/t/2690007/the-contraption-bazaar

Decker users have made a variety of zines, toys, visual novels, and play aids for tabletop games, in many cases without any custom scripting:

https://itch.io/games/tag-decker