What is wrong with that? In boxing whoever gets the first knockout punch wins. In football the team with the best score at the end of the game wins.
Actually when evenly matched pilots go up against each other it's more like a poker match. 3 hands aren't going to decide anything. It takes a ton of hands to decide anything.
why should a lucky shot not be considered a valid win?
It is a valid win and out of a 3 fight match, its value is too significant.
The way it stands now we have one random draw. If the result of that first fight is purely determined by the random plane choice, then the loser has round two to choose any plane they wish to even the score. If then the score goes 1-1 then the other person ahs their choice of plane. So one random draw and a possible one choice plane each. Nothing could be more fair.
If you win the random draw plane, you have a HUGE advantage. Not only do you only have to win 1 of 2 fights to move on now, you get to fight in your best plane if you lose fight 2. It's all about winning fight one. If you win the fight in some random P39D or Bf110C matchup, then you are most likely going to move on.
Anyhow, if what you suggest is true, that the first fight winner will win the match, then all you will see in seven round matches is mostly 4-0 results. Whats the point in that?
No, what I suggest is the winner of the first fight will win the match the vast majority in this best of three setup. In a seven round match that wouldn't be the same. In a 7 round match, say it works out to where you lose fight 1, win fight 2, and lose fight 3 (his best plane>, you now pick your best plane again and beat him, (2-2). Now you've seen how he fights in his best ride and he's seen how you fly in your best ride. The score is 2-2 and you still need 2 more victories to win. All of a sudden it becomes a lot more interesting. Now it actually starts to become a chess game and an actual dueling experience.