I think I understand how & why it's used like instances where a semicircle and a straight line join up, but is it any different to say a smooth point but with the BCP isolated? Is there something going on in the background that I'm not aware of that a tangent point does that a smooth/corner point doesn't?
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Although it would seem to indicate a smooth transition from straight to curved, that is not actually the case—which was also true when using a French Curve and Ruler, in ink drafting. Further refinement (optical adjustment?) might be necessary: