3ds max have Vertex Boundary that can keep plane with sharp corners.
Blender haven’t.
May be I’m doing something wrong.
So how to keep sharp corners in blender with Open Subdivs?
I want to say that creasing it’s not exactly a solution for a scene with many meshes which have edges like in my example.
So option for “Keep corners for mesh” need to be added in future, as soon as possible.
I guess I need to write about this to the developers.
I agree, make the suggestion on rightclickselect or right with the dev.
However, a quick hack for your situation would be to use select > select boundary loops option and apply the crease to all elements without having to select one by one.