I agree with your two main issues. They really couldn't get any of the actors who played Mick and Olivia's daughters, Duke, or Mick's sister? I really enjoyed the first Wedding March movie because the focus was on Mick and Olivia. Then they faded more and more into the background with each subsequent movie. I watched each movie, but I couldn't tell you anything about 2-5. They didn't need another couple in this one. The focus should have been on Mick and Olivia since it was the last one.
I don't think Autumn misunderstood Olivia's advice. It wasn't good advice.
Also, Autumn a