Here are two of my favorites:

Vaults, where your coins can only be spent with a delay, so if you see your coins move and it wasn't you, you can force them to emergency backup address instead.

Lightning and other layer 2 protocols get simpler and more efficient. In the case of Ark, it sheds some cases where you need to trust the provider.

These ideas came up long after the script stuff was disabled. There are certainly more