Construction Tolerances mean building elements are typically set out to whole dimensions. In most cases here, that's 5mm or 1mm. Whilst we can use "rounding" within Revit, this can result in inaccurate results. Rather than rounding, I'd prefer an option to enforce the placement of elements only to the set Construction Tolerance.
I can see potential issues when trying to use in conjunction with angles/vertices/radii. However, in reality Angles are not used for set out. It comes from X+Y positioning. Curves may require some exceptions for the tangents.
Ultimately this could result in much higher quality modelling as no longer users will be able to place/model/detail elements roughly and use the "rounding" features to hide their inaccuracies.