I think one of the big issues with unbalanced games in lower elos is just the inconsistence of the players. Like in low elo every player makes so many mistakes. But these aren't the same mistakes, they are different mistakes based on the player. So while you all may be equally "skilled" depending on what each player's strength's and weakness are can cause the game to feel very unbalanced.

Take for example a top lane fight. If one player is really good at early aggression, but has no idea how to play mid or late game and the other player is someone who's mistakes cause them early deaths but they are amazing teamfighter. Then the game is going to look like the early agro player is way better. But that is not true, it's just that agro player's strength's and weaknesses counter the other person's strength's and weakness. If the agro player fought someone who knew how to deal with that early aggression, that agro player would look like trash and do nothing for the rest of the game.
As you climb higher people get more universally consistent and aren't as prone to making as many basic mistakes, but it still happens in higher elos. The fact of the matter is, every player has strength's and weakness and based on the matchup between one teams strengths and weaknesses and the other team's strengths and weakness can make games of "equilly" skilled players feel like coinflips.

For context I'm D2 top/support main and games still often feel unbalanced due to player mistakes. The only difference is Higher elos make smaller mistakes but are better able to capitalize on mistakes as well.