https://www.anandtech.com/bench/product/2520?vs=2584
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.
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.