Do you believe it's possible to have a "passive" ayahuasca experience? I don't know the answer. Should you work to integrate having a stroke, probably, a migraine... maybe, as much as smoking a joint? Maybe? I'm not sure.

I think the point being any altered sense of perception of routine in regular reality warrants some introspection, the +/- probably depends on how profound it is? You points are good. different part of you, who knows, some people say you're re-tuning the bring to access new vibrations that show alternative realities and dimensions. Lots of big questions here! :)