Also as a developer, I feel its my duty to be a good steward towards people that want to block ads or use classes that will block social media icons using classes from those lists and still look appealing. The client likely doesn't know and neither do the majority of users that haven't enabled such features, but respecting the wishes of those that do I think is the right thing to do. It's in the same class as respecting Save-Data: On or or DNT: 1.