Nice strawman, but portability has long since been achieved.
You say you prioritize usability but then defend an idiotic and regressive design that impedes usability so disgracefully that even Apple has had to admit failure.
The trackpads are another failure, being way too big and thus suffering from spurious contacts from the heels of your hands. Why didn't Apple at least make the giant trackpads useful by having the Pencil work on them?