I would be more interested in Arc if Intel was producing these on their own processes instead of TSMCs.
I know there are technical advantages to the TSMC process and clearly financial ones but I would have more confidence in Arc improving the whole market if they were bringing Intel's production capacity to bear.
It must have been a lot of work to translate their IGP tech over into the TSMC process. Maybe that helps them understand the Foundry processes and will set them up to bring foundry work between TSMC's processes and theirs in the future.