User blog comment:Rupert Giles/Layout Changes: Breakpoints and Typography/@comment-5275700-20150520212753/@comment-1038387-20150520223852

The blog was written April 15 - well in advance of going live. IIRC, it was advertised in the global message, so everyone, everywhere, was going to get the message. Having said that, the blog and initial screenshots didn't make it very clear how the bigger font size would look.

As for sending out an email to admins, that might clash with users' email preferences.