Last year we had a flight out of FLL changed on us by Delta from 10:05 to 9:30. Didn't concern me much.
Then, our last port we were 3 hours leaving because of wind. We were late back to FLL, and it took forever to disembark. We were near front of the line, and left the ship at 8:40am. Through security and ar FLL at 8:45. Delta did have someone flagging people down on the 9:30 flight and they did get our bags checked quickly and we boarded the flight at 9:10. Whew.
10am doesn't bother me at all, and 9am wouldn't either if the ship is scheduled for 6am arrival.
Things can happen sure, but for us it's worth the risk to get home earlier in the day than we would normally. Our flight this Saturday home is 10am.