Lol, who cares? I don't get the halo iGPU obsession. I understand it, but from a user's point of view it makes no difference whether it's on the CPU package or it's a separate board like a dGPU. I care about the product, how it performs, how it looks, how it's priced.
You underestimate the power Nvidia has over OEMs, and also customers. They were bundling Geforce MX series laptops cheaper than Intel's Iris parts. If Intel for example sold their GT3 parts at $20 premium over their iGPU it would have sold pretty well.
Price is like the single greatest reason why iGPUs are wanted by many. Having a 256-bit memory interface on a large die negates this completely.
AMD isn't giving you Strix Halo for charity purposes. It's purely to upsell, and have better margins.
Also, if these GPUs become the lowest tier like you are saying, then the price needs to reflect that too.