Could you explain this a bit more; how does the logic/argument that the problems an immutable blockchain present in this SSO scenario (namely, that it's basically unfixable as a total system) follow that we would never drive cars etc if we continued in that line of thinking?
Cars/planes/rockets seem to be fixable most of the time, or at least we would prefer them to be. (The last one is probably the least-easily fixable, and that is generally considered to be a negative attribute -- something to be mitigated, not celebrated -- and requires careful and even over-engineering because it's so hard/risky to fix a rocket in space.)
Or, perhaps I am completely misunderstanding your point?
Cars/planes/rockets seem to be fixable most of the time, or at least we would prefer them to be. (The last one is probably the least-easily fixable, and that is generally considered to be a negative attribute -- something to be mitigated, not celebrated -- and requires careful and even over-engineering because it's so hard/risky to fix a rocket in space.)
Or, perhaps I am completely misunderstanding your point?