When we attach DWG and start working after sometime we create clipping plane and the PC just stuck and we dont have any choice to even go back, have to press restart button. Also, sometimes the files are sent by some team members and we even dont know about its size. So it is a default option that clipping plane ignore attached DWG files and if user want to then he can enable it from properties. if someone want to always clip then there can be some options to work always in options setting.
I tried in Rhino 7, this is not the case with Rhino 7.