Ramda.js is great!
But being widely popular, it's kept simple and focused not to get to bloated from all feature requests. For instance there is no
maxIn (and here is why),
(since 0.18 there is!),
(since 0.16 there is!),
isEmpty actually handles objects too).
Basically ramda-extras contains the functions I feel a need for but for some reason is not added in ramda.