Comment by ryandrake

At a place like Apple, I can bet that it's not like some contract engineering shop where a blob of programmers just sit there blindly implementing whatever is written by someone else in Jira tickets. The final product that ships in the OS is going to be the result of massive, often heated negotiation between HI and the engineering DRI. A huge change to the look and feel is unlikely to be implemented if there's strenuous objection from engineering leadership.