I bet 90% of them have just changed the default route back anyway.
The Grandparent does not talk about changing the default route, but about forcing all trafic, including local traffic which does not use the default route, through the VPN. The VPN client forces this at lower level than IP.
Yes I, this is evil. A better solution is to use Remote Desktop Service through SSL or similar. This way the local webbrowser at home never connect to the business netwerk. However the exploit is stil posible if you use your laptop at home and at work. (Or visit the unsafe websites with your work computer.