So, the scaling guide posted above is quite interesting. If I am reading it correctly, one of the big advantages of really large rockets is that the mass percentage of TPS scales as a less than linear function and TPS is one of if not the biggest dry mass addition for a reusable rocket. Does that also then support the argument for short stubby rocket stages since they will have reduced surface area to hold a given amount of fuel and propellant and that is less to shield? At least maybe that argument is valid for something entering ballistic, maybe it no longer applies if you need to generate lift as well. ....