User blog comment:DaNASCAT/Technical Update: January 30, 2017/@comment-24014422-20170131170202/@comment-4522253-20170131171806

The function of the feature may still be expanded, and we're considering additional parts of the infobox to expand to. The title and header were the elements that were most often modified.

It should be mentioned though that tabbers are used on a (vocal and significant) minority, and those are not as likely to be quickly added.