In the Canon system you get an extra couple stops of stabilization when both IBIS and IS / VR are working in concert.
This is true with some but not all Canon bodies and lenses where IS and IBIS can work in tandem.
Nikon has already provided a similar facility for the 70-200S via a lens firmware update though apparently only useful with the Z9 when it arrives.
The 100-400 is sometimes reported as having a similar feature from day one and the 105 S is sometimes reported as due for a firmware upgrade similar to the 70-200S.
There can already be some useful stability for video using Nikon camera bodies that have electronic VR. For those not familiar with electronic VR the image is moderately cropped and the cropped out area is used to provided electronic VR.
Not so very long ago VR performance of 3.5 stops was good.
6 or more stops combining VR and IBIS seems to be coming soon with Nikon - though probably initially only with the Z9 and a few S lenses.