[chilmers]

The problem is, changes to the web platform need to be backward compatible. You can't make a global change without potentially breaking existing content. In this case, you could easily end up triggering scrolling in a bunch of places, or with punctuation being invisible or looking bad. So it has to be opt-in.

[chrismorgan]

Refer to my response to jahewson. You can easily apply this to the vast majority of content with negligible hazard.