I mean if you replaced an array of one million objects with an array of one million arrays you'd probably end up with simila performance.

Once again, my argument is that I think there's evidence against making assumptions like "you'd probably end up with similar performance" and that actually testing assumptions like this is worthwhile. I'm not sure how I could make this more clear at this point though, so I doubt it's worth it for me to try to spend more time understanding whether you don't understand what I'm suggesting or are just unwilling to explain why you disagree with it.