I’m able to consistently perform:
- Reminders with or without location tags “add eggs to grocery list” “remind me to check oil when I get home”
- Calendar events “create event about mr Smith tomorrow 2pm” “create meeting with bob March 12 noon” (“with” spawns an invite, I use “about”) “move my 2pm meeting to 4pm” “what’s going on tomorrow”
- weather “what’s the weather like this week” “what’s it going to be like in Manhattan beach on Saturday”
- Calls, by name, number or direct to speaker “call my brother” “call 213-555-1212” “call my dad on speakerphone”
- FaceTime “FaceTime my mom”
- Email “Email my brother” Subject? “take out” Message? “Grab me a burger” ready to send? “Yes”
- Messages, one liner or conversationally “tell my brother I’m running late” ready? “Go” or “message my sister” message? “Call me.” Ready to send it? “Affirmative”
- Math “what’s 128 times 10 million?” “What’s 10 days from next Tuesday?”
- Time “what time is it?” “What time is it in Florida?”
- Location “where is my sister?”
- Automation “living room lights blue” “goodnight”
- Dictation “blah period new line I swear exclamation mark new paragraph furthermore comma open parentheses really close parentheses all caps cats are all caps really all caps really cool question mark” I frequently do complicated technical dictation using Siri, it’s not a problem in fact this particular sentence was composed entirely with Siri with zero post correction.
All of these work consistently and reliably, for me, using either PTT style hold and speak, long-press and wait for the beep, or “Hey Siri” invocation.
Seriously, I use all of this all day every day on an old iPhone, I’m not blind but if I was I’d consider it reliable enough for those purposes.
I don’t do a lot of location, navigation, or searches with Siri because generally, performance is not optimal and you’re not able to focus the intent domain clearly enough with consistent verbiage.