I understood the article as less saying "People are only using personal computing devices for trivialities!", more saying "Entrepreneurs are building businesses with little to no real positive impact on the world".

Obviously the PC is revolutionary given that people can now do things that were impossible/difficult before, like meeting people from disparate communities (see: HN), freely communicating with distant family/friends, becoming citizen journalists through blogging, finding their place in hard-to-find or sparsely-located communities, so on.