Ten years ago, if it didn't understand what I meant, it told me so after 1-2 seconds.
Now, it'll show a loading indicator for 5-6 seconds and then do nothing at all... or do something entirely unrelated to my request (eg responding to "hey siri, how much is fourteen kilograms in pounds" by playing a song from my music library).
Apple shot themselves in the foot in the late 2010s by switching to deep learning methods and making things slower and worse, with the spell checker being the worst example.
Just like a person would!
> or do something entirely unrelated to my request (eg responding to "hey siri, how much is fourteen kilograms in pounds" by playing a song from my music library
My personal favourite is Siri responding to a request to open the garage door, a request it had successfully fielded hundreds of times before, by placing a call to the Tanzanian embassy. (I've never been to Tanzania. If I have a connection to it, it's unknown to me. The best I can come up with is Zanzibar sort of sounds like garage door.)