This is one of those bugs where I have made a change, but because of what you're suggesting in the report, it's roughly "as designed".
On the whole, title attributes here aren't necessary when they'd simply repeat the normally visible text. The "points" example expanding to "trophy points" is an example of where we should have a title. The proper change here (which I've just done) is to remove the title from "reaction score". That was a historical leftover because the text used to be "Likes" with a title of "Likes received" to further clarify.