Moreover, quite a few haiku poets believe that "composing renku will make my haiku worse," which is also thought to contribute to renku's relative unpopularity (in a haiku, the poet can express his or her own little complete world, whereas in renku--which are sequences of linked verses, after all--each poet must leave conceptual space for additional thoughts to be added on, and thus cannot express any notion of completeness in any one verse; this is thought to be why many haiku poets look down on renku).
また俳人の中には『連句をやると俳句が下手になる』と考えている人も少なからずいるのも原因の一つとも考えられる（一句の中に小宇宙を込める俳句に対して、連句は複数の句のつらなりであるが故に、次の句へのつなぎの余地を作るために、あえて一句の中に全てをこめない作り方をする、という特性から、そのように言われるものと推測される）。