i get it. their designs offer benefits. but these conceots have been around forever - look at with processor caches. its just pushing that further by moving to more and more integrated systems into the die. good and bad.Read some more. Specifically about the physics of having RAM on-chip physically very close to processing and with less memory controller issues in the way.
again this isnt a 'cant be done' its a manufacturing, cost choice, efficiencies trade off.
x86 designs that arent unified can still outperform these designs, so to think its 'required' to achieve high performance is silly.
its all trade offs. and consumers dont win with the trade offs that were made. im not saying what theyve done is shi7, just saying its sh!tty.