And I don't disagree there. I never said Intel should use EMIB on lower end, but build it for the i7 and i9 series (maybe i5?); not even necessary for their X line exclusively as the K line is still expensive enough to justify it, lol.Chiplets don't make economic sense at the entry-level, which is why AMD went monolithic 12nm for its 3200G and 3400G instead of using a chiplet and IO-die with IGP or GPU chiplet. In all likelihood, AMD's next generation of entry-level APUs are going to be monolithic 7nm: can't afford the extra design and manufacturing overheads associated with chiplets on ~$100 chips, which is about the same price point as the cheapest Icelake models.
Chiplets only work on fashionably large designs where the added overheads don't contribute a disproportionately large amount of cost and complexity. This works reasonably well for AMD's $200+ CPUs because AMD's primary focus is EPYC and mainstream is essentially an outlet for salvageable EPYC rejects so it can afford the added manufacturing cost to turn these rejects into marketable products.
Intel's Icelake currently being capped at four lower-clocked cores seems like a strong indication that Intel's 10nm still scales rather poorly at the moment. While Intel could hypothetically make quad-core chiplets, building CPUs using those would get stupidly expensive stupidly fast, so I can't see this happening. Eight cores per chiplet is probably the absolute minimum where this makes any sense and Intel's 10nm can't deliver this yet, probably never will with most R&D moved to 7nm.
And no, Ryzen 3K is not rejected Roma parts. I'm confident in that being the case for two simple reasons: the CCX'es may be coming out from TSMC with little issues, so they won't have many defective ones. The proof of this could be thanks to how little time they took to announce the 16 core part. The other one is more obvious and implied in Ryzen's design: the packaging. It's completely different from Epyc's and even though it uses the same dies, thanks to the previous, they can be scaled down to reasonable price points.