This, I'm not so certain. That big 1966 hullabaloo between the Mahasi camp and the Kheminda camp in fact turned on allegations that the khanika samadhi promoted by the Mahasi camp fell short of the Commentarial upacara samadhi.mikenz66 wrote:Certainly the Mahasi literature does mentions upacara samadhi (access concentration) as the minimum needed to suppress the hindrances and work on gaining insight.
I think it's probably scholastic obsession with nomenclature, rather than concern for the connotation of the denotation.
Which probably explains why AN 5.28 leaves the 5th factor of Samma Samadhi unnamed. The Buddha probably foresaw the sticks-&-stones that would fly when trying to name such a variably different experience!