One question is whether they'll go down the chiplet route for higher end CPUs, then they can share a single die, binned differently, across more of their range, and just bundle them into different MCMs.
The 3990X costs more than ten times as much as the 3700X. It has eight times more cores. On anything threaded it smashes the 3700X. On anything not threaded it... doesn't. In many cases it loses slightly because the turbo clock is lower.
It basically means that the processor with the best single thread performance is somewhere in the lower half of your lineup and everything above it is just more chiplets with more cores. That's perfectly reasonable for servers and high end workstations that scale with threads. I'm not sure how interesting it is for laptops. Notice that AMD's laptop processors don't use chiplets.
Even the highest core count Threadrippers have decent single thread performance. The Epyc lineup has much lower single core performance and that may make it less useful for desktop workloads.
AFAIK the AMD distinction is currently that APUs (mobile or desktop) don't use chiplets.
On the whole my guess would be that we have the iPad Pro and MacBook Air using the same SoC, the MacBook Pro doing… something (it'll still need integrated graphics, but do they really sell enough to justify a new die? OTOH they do make a die specifically for the iPad Pro, and I'd guess it's lowest-selling iOS device v. highest-selling macOS device, and idk how numbers compare!), and the iMac (Pro)/Mac Pro using chiplets.
Don't worry, apple already tiers most of it's hardware by soldering in the ram / storage & charging an offensive, obviously price gouging amount to upgrade - even though the maximum spec has a base cost to them of 1/4 to 1/6 of what they charge FOR AN UPGRADE.
