That's the Innovator's Dilemma at work. In retrospect, taking the iPhone deal and subsequent business is pretty much the only way Intel could have kept TSMC from outflanking them in volume at the leading edge. Pretty sure that Otellini would have taken the deal if he got to see how things played out for Intel, Apple and TSMC in the future. Miss a disruption and get left behind.The iPhone decision was most about the necessary CAPEX for the fabs, magnified by Job's low unit price demand. Even in retrospect, fabricating A-series chips never looked like a winning plan for Intel. Intel had the wrong cost structure for anything but high-margin (to Intel) chips.
The lack of a discrete GPU strategy was not a gross margin issue. It was a "we don't need them because we're going to win with integrated graphics" for clients, and datacenter GPUs were a niche, and small one at that, with annoying SIMD systolic array architectures that made finding a killer app daunting until LLM training came along. I remember when GPU-accelerated database management software was thought to be next big datacenter thing. That turned out to be a small niche. Supercomputers, which used to be the realm of systolic arrays, went to scale-out x86, even rolling over Intel's own i960 in the process. If it wasn't an x86 CPU, it wasn't a good plan. By the time datacenter GPUs got hot in the market, Intel was (IMO) too far behind to develop the product maturity to catch up. And Xe HPC is not an easy architecture to evolve. Have you ever looked at it closely? This is one complicated beast of a product line.
True, it wasn't really a margin decision per se. It was take enough of the market doing the easy-to-do, x86-adjacent high-margin stuff, that the discrete GPU remains a niche. But the problem is that the niche GPU evolved into the AI beast that ravaged customer spend on Intel's data center products.
In both cases, Intel failed to make a lower margin bet in an area that eventually disrupted their core product lines.