"Supposing it were possible to have deep, sound sleep forever. Would you want it? If one does not like the kind of happiness that comes with sound sleep, it may be difficult to have a preference for nibbāna." 1/
I think this is why I like Shinzen’s literal translation of shunyata as zeroness instead of emptiness. Of course, SYs model makes use of the nonduality between zero and the ‘two doings’ of expansion and contraction That’s beyond my pay grade - So I don’t know how that fits here