You only need to type
why pie charts are bad
on Google to find thousands of articles full of (valid) reasons why other types of charts
should be preferred over this one.
Therefore, because of the little use due to the reasons already mentioned,
making pie charts (and related) in R is not straightforward, so other functions are needed
to simplify things.
In this R package there are useful functions to make tasty pie charts immediately
by exploiting the many cool templates provided.