In the following discussion: https://it.wikipedia.org/wiki/Discussioni_template:Interprogetto#Template_Interprogetto_e_Betafeature_.22Altri_progetti_nella_barra_laterale.22 there is consensus to activate by default the 'other projects' beta feature on it:w.
All the projects available on wikidata should be enabled (as recently done on https://it.wikivoyage.org).
Thanks