Why not just have a simple system like

each win scores 1 point

whoever has more points after 10 minutes wins

or whoever has more points after a total of 100 points are played, wins

or whoever has 20 points more than the opponents wins

or maybe a combination of the above

Why have several games, and then count the winning games?

This could create the result that one player win more individual points but loses the overall match.

E.g. best of 3

player A - Player B

11 - 9

0 - 11

11 - 9

0 - 11

11 - 9

5 rounds are played and player A won 3 games vs player B 2 games

However, player A scores a total of 33 points while play B scores 49

Why is it fair for player A with fewer points to win the match?