BTW I also by far prefer to capture my images at ISO 64 disregarding ETTR or ETTL,,,
Of course. My point is (and this is why I bring this up in the context of Micheal chasing the holy grail of sensor performance) that if you consistently underexpose your images, even at ISO 64, you are not exploiting the potential of your sensor, and by far. E.g. if you consistently underexpose by two stops (compared to ETTR), you could improve your DR by almost 2 stops (I say almost because you have to be careful not to blow anything, so it's usually worth stopping a bit earlier unless you are tethering and can see your RAW histogram while shooting) without buying any new piece of gear.
To get the same performance, you could also wait a decade or two until they release cameras with a base ISO of 16, if that will ever happen, just so you can continue exposing the same way (i.e. two stops under).
Anyway, we won't get 16 stops of dynamic range with a 14 bit ADC, however you define DR.
In summary, my point is that if you are trying to squeeze every last tenth of a stop of DR from your gear, you cannot afford NOT to apply ETTR.
