What stays human on a phone
Fast chat is still chat, and chats mishear. A page built in three messages can carry a wrong date or a misspelled name, so the check is yours no matter the screen. The convenience is that you can do that check right now, on the phone you built it with, rather than waiting until a laptop happens to be free.
That means confirming the date and the exact venue, spelling the names right, and naming who is invited. The assistant never imports your contacts. And if a detail should stay quiet until the day — a location, a surprise — you set the page password rather than trusting a draft to hide it.