Consider the sentence "She looks beautiful on Thursday." In this case, "beautiful" is connected to "looks" via an acomp edge. We presently don't get (She, looks, beautiful) as a simple extraction or (She, looks beautiful on, Thursday). It probably makes sense to include acomps with the relation. The acomp adjective can be further modified i.e. "very beautiful".
Consider the sentence "She looks beautiful on Thursday." In this case, "beautiful" is connected to "looks" via an acomp edge. We presently don't get (She, looks, beautiful) as a simple extraction or (She, looks beautiful on, Thursday). It probably makes sense to include acomps with the relation. The acomp adjective can be further modified i.e. "very beautiful".