I don't see how the above can be viewed more wasted opportunities than AO 12 or 17. Those were 5 set losses which by de-facto supersede 4 set losses, which you seem to agree with by playing USO 2011 next to last. The 2014 Final against Wawrinka was one of 2, Stan torched him or Nadal was injured, in which case that's not wasted as it's not the player's fault they were injured. Then 2007 Wimbledon was always in Federer's control except for a tight affair at 2-2 in the 5th but Roger won that and took it home comfortably.
I think 2017 AO is tops followed by 2012 as he was up a break in the 5th but against Novak he's facing the best returner of all time whereas against Fed, well Roger has a terrible BP percentage and he had the mental issues not having beaten Nadal at a Slam in a freaking decade. Wimbledon 2018 is 3rd as he had ample opportunities and in effect choked on some of them but Novak held firm and you can't really look at a 10-8 set and say one guy wasted the match so much as you can say one guy outlasted the other.
Well, you're entitled to your opinion. That's mine. The AO 2014 was the most winnable match out of all of these, and the most wasted oppurtunity because he could not perform as he would normally have. This list is based on not how close he was to winning, but what I feel was the most wasted oppurtunity.
WB 2018 I felt Nadal should have won the 5th set and 3rd set, he just got tight at the end of those sets and blew it. That's why I rank it number 2.
WB 2007 Nadal was the better player for most of the match again but was too tight in the fifth set. But to be fair Federer did step it up a notch here so maybe I overevaulated a bit.
AO 2012 and AO 2017 did not feel like missed oppurtunites to me because I felt the other player was better for most of the match and deserved the win.
Hope you understand my logic and bit better