I really have to wonder if his “starship” doesn’t have something akin to an inertial damper/gravity shield generator built into it...
Especially when he moved to stainless steel as the building material....
He could be the conduit for releasing previously withheld tech, then after getting a bunch of people in space he comes out and says.... “This device here” it is in all MY SHIPS!!!
And I have just released the plans on how to make them!!
“And the roads must roll” ~ Heinlein
If he had an inertial damper/gravity shield generator, he wouldn't be building rockets at all. :^) The switch to stainless came from a structural integrity issue and the heat of reentry.