SO you point to a thread where Michael states that someones operation in a model looks like a bug??

Then he gives some explanation of how to get MoI's geometry library to succeed the apparent bug by doing some scaling on the model to complete the operation, then continue on...

The discussion of the internal tolerance settings of MoI is some insight to the process. Some of the commands that do iteration to complete using adaptive tolerances are creating less dense, unwanted heavy geometry.. But it does not mean that The created model is not accurate..

WHat you pointed to was a situation where the command on the model couldnt handle the request at hand due to some possible bug hitting some of the internal workings of MoI, with a solution provided...

This doesnt mean that your 5 inch line may be 4.99 inches long....