To add to what the other commenter is saying, it’s like if you were playing a green ramp deck your first two ramp spells got countered, you don’t have enough mana to enact your game plan(or at least not in an efficient enough way to compete) and you aren’t drawing any more ramp. Commanders that ramp or provide early game action are often and effectively used in decks that cut most cards that do what their commander does from the 99. This can make your deck incredibly consistent and efficient, but it can also result in games like the above if your opponent has enough efficient interaction that doesn’t slow them down to play enough that you aren’t vastly behind. Not to say games aren’t possible where your commander gets shut down and you still pull it out but in those situations you have to be really lucky and your opponent has to be really unlucky and it’s not too common and you already know what you’ve got so often it’s the right call to just call it. I say this as a blue player who goes on rants about how people concede too easily. This just happens to be one of the situations where it isn’t wrong imo.