Given WPs aggressive backwards compatibility in the past did not expect this. But I am happy with it. The Bootstrap 4.0 CSS framework dropped support for IE 9. I would never guess WP will go even further. Not that IE 10 vs IE 11 will matter that much but still.

I wish they would go into that direction in general, when it comes to PHP and other things. I know its supposedly one of the reasons why WP is so successful but tech is moving so fast I think software should not slow it down.