[BadbarmrapBef]

With what? I said there are three samyuttas in the Samyutta Nikaya directly related to what we're talking about, which is a brute fact.

Just more scholarly study. Reading the Jhanasamyutta will not help one reach the sign post of jhana.

Reading the SN will not help anyone or anything. Just more ideas & discursiveness.

MN 117 is the essential sutta to learn about right mindfulness.

In the AS, the Buddha said:

I don't say that there is mindfulness with in-&-out breathing in one of lapsed mindfulness and no clear comprehension... In short, the AS is for stream enterers. The SS and KS are for putthujanas who struggle to take the great leap into full scale letting go & abandonment.