mikenz66 wrote:Since the point of the suttas is to inform practice, does anyone have further comments on their experience of the relative stability of concentration developed when walking rather than sitting?
Not based on personal experience (!) but it might be worth noting that Nanavira thought that he "entered the stream" while undertaking walking meditation:
HOMAGE TO THE AUSPICIOUS ONE, WORTHY, FULLY AWAKENED. - At one time the monk Nanavira was staying in a forest hut near Bundala village. It was during that time, as he was walking up and down in the first watch of the night, that the monk Nanavira made his mind quite pure of constraining things, and kept thinking and pondering and reflexively observing the Dhamma as he had heard and learnt it, the clear and stainless Eye of the Dhamma arose in him: "Whatever has the nature of arising, all that has the nature of ceasing." Having been a teaching-follower for a month, he became one attained to right view.
(Recorded in his private notebook, and published after his death).