I suspect that they chose to do lower iGPU counts on comparable H series packages because it was expected that the H series chips would focus on CPU performance, using the iGPU only in low power modes while on battery. The power draw difference, while tiny, would still be important there. On desktop, it was expected that the iGPU would be more heavily used, and power budgets were more relaxed, meaning that the extra CU would be more useful and less detrimental there. However, no 8CU 4/8 or 6/12 desktop APUs for binning reasons.
For any "ultrabook" that's using an H series processor with no dGPU, its likely not targeted at a user that requires high end 3D performance. Accepting that premise, it makes perfect sense why they are the way that they are. And, if you require maximum iGPU performance in one of those packages, the 4900H still includes all 8 CUs. However, I think that I would prefer one with a 4800U in TDP UP mode instead, with the option to change the TDP in Bios or software.
I do hope that, like there were follow on releases of special models of Picasso, like the 3580u and the 3780u, that there can eventually be a 4750U or 4650U that has all 8 CUs enabled at maximum frequency. I'd like to think that a 4650U with 8CUs linked with a proper LPDDR4X RAM setup should provide for an excellent ultrabook for the road warrior/casual gamer out there.
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