I don't understand this part of your criticism. Your core criticism has been that we don't really need hardware TRNGs because the math of CSPRNGs doesn't lead t

I don't understand this part of your criticism. Your core criticism has been that we don't really need hardware TRNGs because the math of CSPRNGs doesn't lead to "entropy depletion" in the way that people's mistaken mental models might suggest. That's fine, but boot-time seeding problems are also a real source of RNG-related security problems, as described in the "Mining Your Ps and Qs" paper. (E.g. "The removal of IRQs as an entropy source has likely exacerbated RNG problems in headless and embedded devices, which often lack human input devices, disks, and multiple cores. If they do, the only source of entropy—if there are any at all—may be the time of boot.") Having a hardware TRNG for seeding in this case would presumably prevent these problems.