Exactly. No game I've ever played is a 10/10. Games have come close, I'd give Pokemon DS a 9.5, FF7 9.7, OoT 9.8. 10/10 means perfection. There are no bugs (not subjective), there is nothing wrong with the gameplay (subjective). It simply cannot be improved.
It probably will be an awe inspiring game though.
I can already find one problem in the review video's... shooting an RPG blind around corners with one hand. unless Nikko is the strongest guy ever, that RPG is going to go flying the other direction. A 10/10 game would have no issues with realism in my opinion.