first of all you are not disrespectful. It is always okay to be sceptical
Secondly, you are totally right that some users seem to have less errors where others have more with the same procedure.
Hopefully @Ali_Arafat can give some tips and hints if and how we can optimize this issue.
For your interest:
The hexahedral meshing is not based on so called rich geometry formats as for example *.step or *.iges, but on triangulated geometries like e.g. *.stl. In general you should not care about this at all as the triangulation is done automatically prior to the meshing. In some cases, if the geometry model is not "clean", the triangulation can not be done properly and there might be small cracks or duplicated triangles. The meshing is in general very robust in regards to those defects. That is why your mesh is still valid, but we expose this as a warning as it might help in cases where the mesh result does not look as expected. (by @afischer)
Furthermore, the Simulation screen is showing the Mesh perfectly. Which browser are you using? Sometimes clearing your cache might resolve the issue.
This specifies the number of iterations within main snapping iterative process, to attract mesh points to surface and avoid sharp edges. This is done using the extracted feature edges in the castellated mesh step.
If you have questions or if I did not understand you correctly, make sure you ask again.