couse 10% globaly of XP users depend on country … I have small site in romania and serbia… when I changed few day ago to cheap ssl cert, my statistics grow up (about 20%).
Many people use windows XP … I want to serve only SSL site, and insert links directli to https.
So I can’t filter request depended on operating system/browser.
Windows XP dramaticly going out from global traffic… but still is there… I think we must wait one maybe two years to ignore it.
But now everyone must check statistics in country, or (if have) check how many users on site use windows XP.
BTW… on letsencrypt.org should be big information about this issue!