I don't think it derailed it, I think it actually highlighted a very important point.

You're right that disregard for the side-effects are common, but this disregard is also often in discussions where the dosage is low and so probably fairly safe.

Dose always matters, and this should be more widely communicated for meditation practice.

So while I don't think it's valid to extrapolate results from an intensive retreat (high dose) to casual meditators that meditate maybe 20 mins a day (low dose), pointing out the relevance of dosage is insightful.