. . . In your case - if you aren't seated in a timely manner and you will miss your FastPass time, just explain why you are leaving. It's not your fault, it's Disney's fault for the slower service . . .
1) If you fail to eat at the restaurant, they can still charge you the Non-Show fee.
2) After all, you did not eat.
. . . simply "showing up" and not getting charged is valid at only one eatery of which I know
. . . the manager on duty at the end of the day has the sole responsibility to charge or not charge you
. . .
showing-up means showing up and eating, not just appearing at the podium
3)
There have been MANY instances where people walked away from an ADR delay and were charged the fee.
4) It is not Disney's fault for "slower service" and delays in ADR seating
. . . in many cases, other guests just haven't left their tables
. . . Disney doesn't force anyone to leave when they have completed eating and are siting and talking
. . . people frequently take longer in order to rest and sit in the A/C
. . . or, the group just wants to catch-up and gossip a little while
5) One has to remember, ADR is not a reservation or appointment.
. . . it places you in a queue for the next available table for your group size
. . . this could be exactly at the time of the ADR, or anytime thereafter
. . . the restaurant is not at fault when your FP is so close to your ADR time
. . .
it is your responsibility to allow ample time for eating and riding