A point I think many people are overlooking. Furthermore, to the extent Burevestnik or the seaborne device can deliver nuclear warheads, very little in bomb phy

A point I think many people are overlooking. Furthermore, to the extent Burevestnik or the seaborne device can deliver nuclear warheads, very little in bomb physics has changed since the last tests were run. It was my understanding the US bombs production and management facilities ran tests until simulations were good analogues of what they saw in the real test, at which point it's both cheaper and faster to run simulations. The only possible reason to run real tests, is for a political communication, although who is receiving it and what it says to them, isn't clear.