@ntxdave said:
it appears that the dashed lines works in a way that all the sages tell us not to do.
Hope someone can show me that I am wrong!!
You are mostly right but partially wrong.
Indeed, the new dashed lines are implemented via layers. There are some issues with this method. If you set individual edges to use a dashed line layer, yes, you will violate the standard advice to use only Layer0 for individual edges, with all of the same potential issues as before the dashed line option. This visual effect has no impact on whether edges interact with other geometry. If you set a group to use a layer with dashes enabled, all the edges inside that group will receive the same dash pattern, which might not be what you wanted and so will force you to create additional nested groups based on dash pattern.
However, you don't need to violate the advice to always leave Layer0 active. You can change the layer of any geometry after it is drawn without making that layer active. Also, you can toggle an existing layer between solid and various dashed patterns after the fact and everything that uses it will follow suit.