Line width in model space


Could someone explain me how useful a constant line width display is in model space ?
Why does the line width is kind of an alien compare to 3d objects while zooming ?

Maybe a concept I don’t get.

If there is a way to make printdisplay show a line with its real thickness in model space it will make my day ! (e.g. thinner from far, thicker from near)


This is implemented in Rhino 8

Good to know.
It will make a future day then.
Thank you.