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The Nikayas reflect a cross-pollination of brahamical meditation techniques alongside the jhanas, which are an essential aspect of sammasamadhi.

thanks Dave

my impression of the Nikaya is, it appears, for anything to be "samma", it must be based in right view

Unlike the formless attainments, the jhanas can be characterized by...satisampajanna, the absence of the hindrances, and the development of the seven factors of enlightenment

what about this:

And how is the mind said to be internally positioned [stuck internally]?

There is the case where a monk, quite withdrawn from sensuality, withdrawn from unskillful (mental) qualities, enters & remains in the first jhana: rapture & pleasure born from withdrawal, accompanied by directed thought & evaluation. His consciousness follows the drift of the rapture & pleasure born of withdrawal, is tied to... chained... fettered & joined to the attraction of the rapture & pleasure born of withdrawal.

MN 138