User blog comment:Rappy 4187/Technical Update: August 27, 2013/@comment-3279487-20130827193746/@comment-126761-20130828150427

We made the signature limit change for a few reasons. First and foremost, it actually caused some technical problems because the limit was inconsistent around Wikia. Secondly, that low limit just wasn't necessary - so we bumped it up to a round number.

We do not encourage huge signatures - but that concern should be up to individual communities. Besides, simply allowing more code is not equivalent to users using it, nor the result taking up more physical space: you could already cover huge amounts of space even with the old limit.