I think a lot of it has to do with constant changes that suddenly break phrases people are used to using. For a personal example, I had a six-month period wher

I think a lot of it has to do with constant changes that suddenly break phrases people are used to using. For a personal example, I had a six-month period where Siri stopped understanding the word 'half' (as in, 'Hey Siri, volume to half'), and either ignored or misinterpreted any command that included it.