It is Nvidia's IP. All the issues related to flexibility.If Intel is going to be buying NVidia chiplet for certain percentage of its line up, why not the entire line up?
Having your own IP is good.
Xe IP especially Xe3/3P onwards is already going to be very decent for many things(gaming, compute, AI). Then there's media engine as well.
Intel is pretty decent in these areas.
Fully abandoning is a huge risk and years of work down the drain. Takes a lot of effort to begin again.
Don't think it should abandon GPU IP.