User blog comment:Rupert Giles/Layout Changes: Breakpoints and Typography/@comment-3544775-20150528170547/@comment-452-20150528172139

"Of course those who didn't care how it look on larger screens, are innocent angels"

You appear to be constructing a strawman. Please link to a comment where someone has said they don't care how it looks on larger screens.

I know of at least one comment where someone has expressed concern about not being able to preview properly at larger screens, and additional comments about the preview not being accurate in general.

In any case, this update also solves the problem of people optimising their layouts only for smaller screens. For instance, images to the left and right of paragraphs will no longer be "bunched up" due to the paragraphs being shorter when viewed wide.