I’ve done that regularly in the past but I had a weird variation of issues. For Lenovo T430 with Integrated HD 4000 + Nvidia NVS5400m optimus, it turns out the VGA is hard-wired to be ported through NVS5400m only and Display port is hard-wired to port through integrated GPU only. So it always gave me trouble:
Only Intel = no VGA access
Only use Nvidia = no Display port access
Use Nouveau = access to VGA + Display port, but weird “double mouse pointer” issue. Basically everything was rendered twice and when I connect to an external monitor, I will get a second mouse pointer in the centre of the monitor which I cannot move.
Bumblebee only started working properly in Leap 15.0.
Similar issues with W530. I’ve since then opted for bumblebee+Nvidia driver to make everything work on optimus capable laptops.