When adding an infobox using data from Wikidata, please check for consistency with the article and its references, and to address the inconsistencies observed, which can be done by amending the article or the Wikidata entry, or by supplying a better value to the infobox as a local parameter if this is what emerges from the sources.
It allows editors at the article level to blacklist various fields so that they do not display. This makes a positive statement that those fields are unsuitable for inclusion in that article's infobox.
This can be used outside of BLPs if the editor wishes to see all of the information, sourced and unsourced, available on Wikidata. Generally, though, it is better not to use |onlysourced= as it will help to reduce the effects here of unsourced vandalism on Wikidata.
Using custom values
In addition to above, you can also add custom values, or use custom values instead of wikidata values.