Perhaps... 

Perhaps you didn't read the article, which did have cited evidence of IP users being effective members of the community, and evidence. So I shall quote a piece of it here:

"A large portion of our good edits come from IP addresses; positive experiences with initial IP edits lead users to create accounts who otherwise would not do so; recent changes disabling IPs from creating new or editing semiprotected articles are sufficient. According to Jimbo Wales, "what is commonly called 'anonymous' editing is not particularly anonymous ... and there are good reasons to want vandals on ip numbers instead of accounts." While about 97% of vandalism comes from anonymous users, about  or 82% of anonymous edits are intended to improve the encyclopedia. (Prohibiting IP edits would not eliminate 97% of all vandalism, because if they have to, those inclined to vandalism could easily take the 10 seconds to register.) The ability of anyone to edit articles without registering is a Foundation issue."

IP users are an important part of the community. Don't hate.

P.S.    Eli's Coming...