Passive play-style better than aggressive?

Not really. Both are bad on their own, you need a combination of passive and aggressive play.

timed aggression.

The aggressor that failed a 1000 times knows exactly when he can go for something. playing aggro is more of a learning by failing thing, being a passive player is just an excuse for being bad at laning phase

Aggression is better in certain situations and specific moments : enemy is less skilled than you, over aggression is okay, and when enemy makes a mistake Passive play is more important the closer your skill levels are, and then aggression at specific points.

I am incredibly passive... I even avoid engaging into my opponent unless it is absolutely necessary.

Most of the time, it goes well.

When my jungler ganks, I just do one hit and back off.

Ain't nobody got time for fighting during the laning phase.