I used to be playing OW hours after hours after ... 6-8hrs a day or more I know ...
So if you play a lot of games doesn't matter that is comp or unranked you will run into a lot of bad players and teamcomps and you will get tilted more often than not.
In the past I was pissed off being in OW silver, gold and higher ranks later on literally playing thousands of games and someone in the ow forum said the same thing to me. It does not matter how many games you play but the quality of the games.
These days I spending most of my time on binance making money left and right so I have little time for games and now I get it why he said that. I was mad at these diamonds then plats then GMs who come in here and play like what 5-10 games in a month whileI played 1000 games in a month and hardly moved rank.
But now I also understand one more thing time is money and better keeping games to be games. This is why after having 1-2 good spike rushes and 1-2 good rated/unrated I put the game down even if all won. Simply because if I keep playing the mm will put me into terrible games and I will get TF anyway.
It's better to have a couple of wins for a day than tons of losses and some wins.