I placed eggs into boiling water and because my hands were wet I used voice and said "hey Siri, start a timer". It replied "you'll have to unlock your iPhone first", so I hovered my face over the bench the phone was sitting on, then the screen rattled and prompted for the numeric passcode. Ugh..

Using Siri essentially required me to use my hands anyway, so what's the point of voice?

I'd very seriously consider moving away from iPhone to a device that treats voice AI as a first class citizen (presently I mapped the 'double back tap' to open grok voice chat, and triple back tap to end it, which is a wonderful improvement over not having these, as you can do that pretty easily, even while driving etc).