Recently (in https://github.com/BHoM/BHoM_Engine/pull/3283), collinearity check has been changed from numerical solution to a geometrical one, i.e. instead of computing matrices of point coordinates, a line is fit in point set and then each point is checked whether it lies within tolerance from that line. This change improved precision and robustness of the method, so I believe it would make sense to do similar with IsCoplanar.
Description:
Recently (in https://github.com/BHoM/BHoM_Engine/pull/3283), collinearity check has been changed from numerical solution to a geometrical one, i.e. instead of computing matrices of point coordinates, a line is fit in point set and then each point is checked whether it lies within tolerance from that line. This change improved precision and robustness of the method, so I believe it would make sense to do similar with IsCoplanar.