Can only hope in the future we can say "computer", state what we want and then ack with a beep.
Anthropomorphizing is all marketing and tricking people into attachments to devices. A side effect is that a wrong response creates not only annoyance (oops wrong prompt), but now also disappointment (why doesn't Siri listen to me!?).
That's how it is with my Amazon Echo, after a couple of settings tweaks (wake word and Brief mode). But I would love to turn off the impromptu suggestions it occasionally makes.
I would think 'tone of voice' would carry more nuanced information than vocal good manners. Our pets can understand some words, certainly tome of voice, but not whole sentences.
It’s a good habit to keep up.
A fun Siri easter egg: If you ask it "Do they speak english in what?" it will simply respond "What"