First like I said above, the lenses aren’t mounted the same on DSLR vs R or RP and this is all slightly relative. But here’s the absolute, RP and R lens mount is closer to the sensor and deeper into the grip about an inch. Probably less so on the R.First, understand that the R + RF 28-70/2 is physically longer than the 5DIV + EF 24-70/2.8 II with the lenses retracted. Then look at the TDP measurements (Bryan does know how to measure things), showing that at full extension the RF 28-70/2 is 0.66” longer than the EF 24-70/2.8 II. Now explain how a longer body + retracted lens combo with a lens that’s longer at ‘working dimensions when zoomed out’ results in a combination that’s 0.5” shorter, according to you.
The 28-70 is .66” longer extended unmounted but if it’s sitting about an inch closer to sensor there’s a half inch. The 28-70 can also sit slightly longer or equal to 24-70 mounted and still be shorter because it also has .5” less travel on extension.
Both pictures are deceiving. Move the R body back so the LCD screens are equal and in line with where your hand will be holding it. Yes it will move slightly forward when up to the eye. But the camera spends way more time in my hand vs in my AND up to my eye. I also shoot live view often.
I really think you’re missing the forest for the trees here.