Because one important feature of the large MB Pro is the availability of a dedicated GPU making it a decent graphics machine when connected to an external screen. I am certainly stressing the GPU of mine :)
Re:27-inch iMac gets a major update
by ogre_codes on Tuesday August 04, 2020 @03:53PM
(#24053838)
My thinking is this is exactly the use-case Apple needs to prove they can compete with and arguably the case where they should shine. With ARM's much better thermal characteristics, Apple should be able to get much better graphics performance.
It's certainly the tougher nut to crack.
Why? The 2015 15" came with an integrated GPU option (and that was by far the most popular SKU, AFAIK).