Since dynamic mesh preview, red dot is snapped to closest vertex.
That is a regression for dynamic topology. Dynamic topology adds geometry where it is needed.
By definition, it is not there, yet ; while user is foreseeing to place a new stroke.
Imagine that you want to create a pattern with radial symmetry on top face of a cube.
Current behavior is useless. Red dots for symmetry will not show up.
The goal of dyntopo is precisely to avoid to subdivide uniformly the model if details are only added on one side.
But that is also a disturbing annoyance to see the red dot, not centered, while making a clay or a draw stroke, for no reason.