How is it ~800?
The fully staffed armory vehicles and transports require well over 400 Marines,
lol. And that's by the limited list in 3rd Ed which doesn't include the 4th, 5th, and 6th edition released vehicles not included on that list,
lol.
We're talking about, if a Chapter chooses to utilize all of its vehicle assets, it is reduced to anywhere from 50-55% of its authorized infantry strength.
It's already obvious that 1,000 Marines is a silly number, but it's
40K. Space Marines do amazing things it seems. Since that's the arbitrary number assigned by
GW, it's not about what "should" or "would", only an analysis of how drastically one operating model is affected versus the other.
You're going to have to explain how having dedicated drivers "
exacerbates" any battlefield issues other than perhaps berthing facilities on smaller vessels of the fleet,
lol. This argument defies all logic, and any military theory or application.
"I have too many guys." Said no military commander ever.