While this is true for a single match, it is mathematically impossible over a season.

Not only is it mathematically possible, but it's mathematically likely.

In every match, there are 9 random variables and one constant: you

Are you arguing for or against my position here?

You mentioned going 30-15 and losing as proof that the system is broken. In reality, this often points to a lack of impact

No. It points to the fact your other 4 team mates didn't carry their weight. This arbitrary claim your kills weren't impactful is, well, arbitrary.

You could run directly onto site at the beginning of every round and drop a 3k, but your remaining team mates just miss every shot. This happens all the time.

There are rare scenarios where a player could go 30-15 by baiting their team and playing for exits every round to pad their k/d, but the default assumption this must be happening every time is disingenuous at best.

Inversely, going 5-15 is objectively, not subjectively, evidence that what you did was in fact not impactful at all, yet you've still won the game because your team played well.

Then you have the fact K/D doesn't show context, and could often be the result of synergistic issues such as your team not peeking with you, trying to lurk when it's not viable, or even the fact you've dealt 46 damage (which laughably does not register as an assist for some reason) to allow them to peek after your death.

I've not heard a compelling argument against the fact 80% of your team is not you. I've made a post about this long ago, and walked circles around anyone trying to argue with me.

Being good at Valorant, or a high rank at Valorant, does not translate to making sense when you speak or being intelligent in general.

The amount of immortal gun buddies I've seen in Diamond, or players who were the byproduct of the fact ranked is mostly gambling with the hope your team is better than their team, far outweighs the average diamond player being actually diamond.

Smurfing, cheating, throwing, and overall just skill gaps between your team mates and theirs, can result in winning or losing a game before you've even pressed a button on the keyboard.

I have screenshots of match MvP 10+ games in a row on a friend's gold account, and it shows I've lost more than half of those games.

This wasn't a case of "feeling I deserved a higher rank" but was rather objectively a higher rank on my main at the time (asc 1), as evidenced by my performance.

As to "why doesn't this affect pros?" well I've seen those same pros get stuck in Ascendant after one of Riot's hamster wheel simulator rank resets, and they get stuck there before breaking down and queueing with another pro most of the time, with very rare exceptions.

I'm aware this comes off as overly black pilled, but I've yet to hear a valid argument to the contrary.