Actually, much of the heating has absolutely nothing to do with friction... It's mostly heat from the compression of the air resulting from the shockwave accompanied by stagnant subsonic flow at supersonic speeds... The heating itself occurs only at the shockwave itself, which then radiates heat to the stagnant air and aircraft/spacecraft surfaces... Besides the surfaces outside the nosetip shockwave cone, which generate their own shockwave fronts, the whole ship is almost exclusively heated radiatively (except where there is subsonic flow recirculation).
One thing we learned from the Cold war during ICBM warhead design was that a blunt nose is better than a sharp one... Conventional wisdom would dictate to minimize resistance with a pointy end to have less friction, but that doesn't prevent the formation of a shockwave, and the closer the shockwave is to the structure, the easier it is to radiate heat to it... So with a blunter nose, you push back the shockwave, with more resistance to airflow, yet you gain a lot by reducing the heat transfer and heating rate with a cushion of stagnant subsonic gas providing -some- insulation...