The T2 Does all Encode/Decode HEIC/HEVC, and much more. It also houses the bootloader.
The HEVC/HEIC are free side effects of the T2 handling the webcam. And driving the touchbar. The touchbar is more than a bit of a "side show" from the fundamental security duties. ( and in no way is an overlap to a PCH chipset. )
It really isn't the bootloader. it is the firmware loader. It's missing to stop unauthorized mutations of the underlying firmware. The x86 CPU only ever sees a copy, the master is always kept secured away from reach from x86 code. That is a SMC function.
There is some "ride along" stuff comes from it being a hand me down iPhone chip with some narrow mods stuffed into a Mac. The whole "Much , much more" really should stop if security is really the core missing. All that side show stuff is just more complexity presenting an opportunity to inject more holes if direct paths to the outside of the system.
10nm Intel fab is not for consumers. It's a low yield fab process with lots of issues. You won't see 10nm for the next 12-18 months--only server space.
What are you smoking? The new MBA 2020: 10nm CPU.
AnandTech Forums: Technology, Hardware, Software, and Deals
Seeking answers? Join the AnandTech community: where nearly half-a-million members share solutions and discuss the latest tech.

Dell XPS 13 ... 10nm , Microsoft Surface Laptop 3 (most models ) ... 10nm. HP 2-in-1 laptop in same class... 10nm. etc. There are more than a few volume laptops than could find on the showfloor in a BestBest (if the store isn't on pandemic lockdown). If being sold at BestBuy ... it is in the consumer space.