Oh, AREXX, the one thing Amiga had which still has no counterpart. I mean, the technology is of course there, but the ecosystem and culture is not. AREXX integration is so alien it's hard to even explain it someone who did not see it in action back in the day.

The closest I can think of is Siri and such automation, except AREXX was a full programming language in its own. (The language was from IBM REXX.)