Samatha vs Vipassana. What are the mechanics?
Vipassana (insight) is direct clear seeing thus does not requiring any thinking; therefore it is not antagonistic to samatha (tranquility). Both samatha &amp; vipassana are natural results of the silent collected stable mind called &quot;samadhi&quot;. Suttas such MN 149 say samatha &amp; vipassana are products of the noble eightfold and are developed in tandem.

Thus for him, having thus developed the noble eightfold path, the four frames of reference go to the culmination of their development. The four right exertions... the four bases of power... the five faculties... the five strengths... the seven factors for Awakening go to the culmination of their development. [And] for him these two qualities occur in tandem: tranquillity &amp; insight.
MN 149

&quot;Samatha&quot; (&quot;tranquility&quot;) is not &quot;one-pointed focus&quot; (&quot;samadhi&quot;) nor is genuine &quot;one-pointedness&quot; (&quot;ekaggata&quot;) an obstacle to vipassana. Its appears you are reading the typical non-sense of modern teachers.
I will read the question more thoroughly &amp; completely at a later time and probably add to this answer.