The cockpit position, or better say the monocoque geometry chosen by RB, influences and interacts with many things, even the SIPS position, and including the forward section of the boat (it's the middle section that is baggy)... it's a whole ecosystem that RB exploits fully and completes it with some unique packaging tricks : )
And we didnt need to wait until monaco 2023 to see that floor. In Melbourne 2022 we saw this
https://i.imgur.com/LGvSpN7.jpg
And in Imola 2022 we saw it again thanks to Perez again.
@Venkyhere, the floor design is another subject. The tweet is about the foundations behind it: how the chassis is laid out and how the car is packaged...
Mod edit: Slanderous comments removed…