It has been 16px as default for as long as I can remember. People
designed at 12-14px and it has been trending larger, 18-22px, for quite some time now - at least since 2012-2013. I think larger screen sizes plays a big part in the change, or maybe marketing people realized people dislike small text/prefer larger text? :)
Coders have learned that it's best to not touch the default font size, or resize html/body font size. The ugly 62.5% (16-->10px) is also dying out for accessibility reasons.
