Earlier quoted context omitted.
Some of those share/tweet/like buttons can track you without no interaction, just by loading on the page. Removing them might be intentional for this reason.
True, but imho an ad blocker should just block ads by default. I'm not sure if I'm representative of most users, but I don't really care as much about tracking, just about ads cluttering the page.
First sentence on the project page:
"µBlock is not an ad blocker; it's a general-purpose blocker."