For some parts, it is helpful to have tangent lines on. For other parts, those tangent lines are confusing and should be turned off. But there are some parts where some tangent lines are needed, but some should be off. In the View Properties window, there are options to turn "All Tangent Lines" on or set them to "None". There is also a "Selected" option, but that seems to only work on a part basis. I am suggesting that there be an option to select tangent edges to be visible or not.