I think possession and the ability to keep the ball is the most important quality in a team and can lead to the highest amount of points in the league. If you could score goals with a strong attack and could keep possession theres really no need for a good defence as you wouldn’t need to defend.
I think this is what Man City is doing to some extent. Pretty much every single player on their team can attack and is somewhat of a goal scoring threat/build up. Even Ederson isn’t the best shot stopper, but he doesn’t have to be because he has fewer shots to save. Instead he is amazing playing with the ball and great distribution which in turn helps Man City keep possession.
To wrap things up, I think this has some sort of truth, but if technically you focused on your squad being able to score and then be able to keep possession, theres really no need for much defensive capability. Obviously players make mistakes and this is hypothetical but thought was interesting and I think Man City has somewhat implemented this strategy. Obv with their financial backing and what not it helps them to attain players of this calibre but it also seems this is in their type of training/tactical dept.
Feel free to point out flaws could be completely wrong about this theory
The mistake you’re making is considering possession a part of attack, it’s not. Keeping the ball away from the opposition has a bigger impact on your defense. On the whole, a team with a perfect defence and a terrible attack will do better than a team with the inverse, more often than not.