As I stated in my post, we're always covered by good
travel insurance and have a back-up plan in case the unlikely worst scenario were to occur.
I once read a post by someone who was scheduled to fly in the evening, but their flight was cancelled, and they couldn't get another that night or the next morning. Whereas the next morning's flights went off on time. So in that scenario, had it been a cruise, the person scheduled to leave the evening before would have missed the boat, and the person who left the morning of would have sailed.
The possibilities are wide open in life, and a lot can happen. Each person has to decide what risk level they are comfortable with. Telling people that they should never take a given mild risk is a bit over the top. People can decide for themselves. Lots of people fly in morning of without a problem. If it isn't for you, don't do it. As I stated in my post, I also like to fly in a day or or more before when I can. It reduces risk and allows more time for us to get into vacation mode. But when that doesn't work for our schedule, we'll fly in the day of. And I won't stress about it. Life's too short.