W/L is what is important
k/d is how effective you are
kda is how effective you are with a team
I play a lot of Warzone solo. Originally I thought it was important to steal bases from the enemy team. Stealing bases Alone, my k/d is/was 2.35. This is me playing Recklessly, full force Charging your base ALONE. Im good at stealing your base. And I will often kill 2-5 players doing so. Meaning, Im a strong player, both playing the objective and killing.
But I was losing because Warzone has the problem of stupid players and Extremely High Value AI enemies which invalidate all my efforts, getting 30-40 kills a game with the most base captures. So i changed up my strategy to Stealing Enemy Kills on Bosses. Either getting their before them, or stealing all their efforts at the last minute, because Warzone is Screwed up and need massive attention. I now end games with less than 10 kills, at the top of my team, with 5+ Boss Kills. My K/D will go down, But im winning more often.
In Previous Halo games I only played Objective game modes. My K/d was 1.5, but thats because I was the only person willing to arm the bombs and capture the flag. I could wipe out their team while stealing the flag, but die many more times getting there. But we would win, because a few players were willing to die to get the task done.
However, the importance of Objective Players, throwing away their k/d, shouldnt Minimize the importance of Slayers in Objective game modes. Their K/D Matter. They make my job much easier by clearing the path. Without them id have to kill my way in and kill my way out.
In Slayer games, your K/D and KDA matter. Your ability to kill while not dying and assisting your team in weakening and finishing kills is Important. If your K/D is low your shot might be bad, your positioning on the map might be bad, your combat awareness might be bad, your ability to put yourself in a favorable position to avoid death might be bad.... in all of these cases you likely arent in the right place or capable of assisting your teammates since you are to busy dying fighting single targets.... Id suggest finding a sensitivity that works, finding areas on the map you feel strong in, areas which grant you the ability to run away, assist teammates, and hopefully the ability to control how many enemies you fight at one time. Give yourself as much of an advantage as possible. And moving, move with teammates. People with good k/ds do this naturally. People with low k/ds do not and thats kinda what it Can matter. which is why k/d can be an important stat, since it generalizes your effectiveness.
An Objective player with a 1k/d and up can be valuable.
A Slayer with a 1.8+ in Objective game modes is dangerous.
...kinda reminds me of a friend that only plays with my team in blops2. he has a 1.5 k/d but a 16 w/l in Search and Destroy. because even tho he cant Ace a team, he works well with teams, arming bombs and covering our backs, increasing our chances of victory.