2 Questions if I may🤓

Goodmorning Community. Eric down here in central Arkansas.

1. Has anybody had anymore trouble with the “Follow-Up” suggestions feature or the “Follow-Up” inbox, relating to emails not sending to recipients? I use my iPhone 8plus, and I just early this morning had an email I knew I sent to someone 5-10 mins earlier. However, it showed up in the Follow-Up inbox. Now I’ve read that if you ask a question or the email you send is showing signs that you’re needing a quicker response than usual, it could get moved to there. But still doesn’t explain why it wouldn’t send. Luckily I resent the email 15 mins after I found this email in that inbox. But still wanted to ask if any other answers have been given from y’all or tech support specifically.
2. the next question I had was when will IOS17 be out for iPhones? And how long before my iPhone 8+ will stop receiving updates due to age?😂😂😂