Earlier quoted context omitted.
I've noticed this to be true for table tennis and other sports too. When I play against a less experienced player, it's quite frustrating to notice that most of the points I score are clear mistakes on their part, rather than any kind of skilled moves on my part.
Charles Ellis wrote a book(1) about that. He asserts that any professional sports competition is a winner's game - you win by successfully executing difficult plays and being better than your competition. But amateur sports is usually a loser's game - you win by not making as many mistakes as your competition. The book is about finance but the observation is universal. 1. https://www.amazon.com/Winning-Losers-Game-6t…
And sure enough, when my obsession quickly waned, and without having played much chess at all, I found myself consistently winning from novices who had a lot more experience than I did. In hindsight, I suspect what happened is that they played a better game but were more likely to make catastrophic mistakes.
Of course, I suspect any player with any training probably applies these basic rules already, and would easily defeat me.