Property talk pages often include a variety of templates. Enabling the visual editor would make it easier for people to add/edit the parameters of the templates, if they have template data added.

e.g. https://www.wikidata.org/wiki/Property_talk:P27 includes templates such as

• https://www.wikidata.org/wiki/Template:Property_documentation
• https://www.wikidata.org/wiki/Template:Autofix
• https://www.wikidata.org/wiki/Template:Complex_constraint