That's still not obvious to me. Here you are talking about the ability to focus, basically. This ability doesn't seem to require enlightenment and can be e.g. chemically enhanced.
Brain state. You're comparing the imperfect, deficient brain states of actual live humans with what you imagine could be possible if only proper enlightenment was achieved. You're comparing something real with something you imagine.
Nootropics or stimulants are to be re-dosed and used constantly? Many have side-effects in such a manner, subject to dependence and tolerance. If you are able to enter the flow state or a focused one without, why bother, what happens if you combine both anyway, I don't know?
Besides, the effects of certain stimulants deactivate the default mode and activate the nondual awakened network, like nicotine.
https://link.springer.com/article/10.1007/s00213-011-2221-8
Although, it is unknown if it also does it during rest.
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