Discussion
Why is picking a point by eye rather than by snap a serious fault?
Answer: D
Correct answer: the geometry is then inexact though it looks correct
A picked point lands wherever the pixel was, which may be a fraction of a millimetre from the endpoint intended. On screen nothing is visibly wrong, but the line does not actually meet its neighbour - and the gap surfaces later as a hatch that leaks, an area that reports zero, or a model that will not solidify. Snapping to a defined point avoids it entirely.
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