The StatisticsCalculator has received a much needed interface update in FME 2019 to limit the volume of automatically generated stats that are tagged onto outgoing features, but I'd like to see even more done here. 90% of the time you actually only need to calculate 1 statistic so I'd much rather see the transformer adapted to operate more like the GeometryFilter where you chose which stats you wish to generate and add them on. This has the impact of people not over generating stats and then having to delete them later, plus it'll be quicker because users don't call more functions than is necessary.
This change is focused on efficiency because in training, delegates rarely realise immediately that statistics in here are 'optional' to generate and when they do they spend time fiddling trying to remove them.
