Setting the absolute tolerance to a very small number (with more zeroes) brings too many problems with file density caused by extreme amount of control points of the created surfaces (especially if you use “Blend surface”, “Match surface” or “Offset surface”). While “Match surface” and “Offset surface” both provide options for custom tolerance, the “Blend surface” command suffers a lot by sticking to the file tolerance instead.
Here is a simple example where 4 identical sets of two extrusions were used to create a blend surface in-between. Every blend surface was created at different absolute tolerance to show the huge impact of the latter over the control point density:
Split and Trim custom tolerance.3dm (107.1 KB)
This is why I don’t consider using very tight absolute tolerance as a general solution for the shortcomings of the “Split” and “Trim” commands (as well as “Project curve”) while using them in cases such like the Tolerance test.3dm that I uploaded in the other topic from my link above. 