This is the same as the command line. Just like the command line, voice may not be completely intuitive initially but for regular use, it's probably much faster than a colorful GUI.
"Hey Siri, set a timer for fifteen minutes". Done.
People love to misuse that word.
I just tried it with best case scenarios, and it's still a second or so faster using voice (1.5 seconds) vs control center (3 seconds). I mean, voice is literally just yell out "hey siri set a timer for 15 minutes" and that ends the interaction. Done, just like that.
If you're changing the time that is set, it's significantly longer.
That's friction, and that's where these frictionless interfaces step in.