I remember you insulting my teammate during and after the game with that exact accusation.
Every map has axes of symmetry and should be fairly balanced. If someone chooses T2 Mexes and is later in Navy, that's their own fault and/or lack of scouting. A game where both teams build roughly similar numbers of units rarely ends in a quick rollover.
The idea that you don't want to play the game because you're working towards victory (the end of the game) is funny and echoes The Journey vs. the Destination conflict. Obviously most all players are closer to the Destination side, but on that point I understand the frustration when someone's entire gameplan is to make a Corsair Snipe. Then I also ask myself, “why is this fun for you?” But yes, everyone has their own way of playing the game and as long as it's part of the game, there's no need to ask them unkindly why they're not playing my preferred playstyle.
If you want to change your own experience, there are many maps that have few key points and less reclaim and contestable mexes, I think on these maps you will find your desired playstyle more often as opposed to small mapgens.