Not to speak for the tidyverse team, but I always saw these more as "presentation" packages than EDA packages, so they fit in the RMarkdown/Shiny Communicate step of DS. Also, they are technically part of the group of packages we usually refer to as htmlwidgets: http://www.htmlwidgets.org/
I wound up explaining the leaflet package to them as part of a suite of R/Javascript packages called HTML Widgets, and pointed them to that website to learn more.