Juniorization is a term used by Adult Fans of LEGO (AFOLs) to both describe and criticize the inclusion of a few highly specialized elements in sets instead of already existing elements that could be assembled into the same configuration. A BURP (Big Ugly Rock Piece) might be considered a juniorized element but it is more common to refer to pieces such as which is simply an element that reproduces five of stacked together. Juniorized elements are simple, rather than complex POOPs.
The major complaint is that the use of juniorized pieces reduces the possibilities to build alternate models, a cornerstone of AFOL activity. Some AFOLs, however, revel in the chance to use these elements and consider their inclusion in MOCs a challenge.
Another juniorized element was the BFC piece (Big Freaking Castle).