Grids in the form of layer of gridded-squared-polygons are used a lot to display indicators, index and other thematic mapping.
Hexagons grids have a number of advantages over rectangles (see http://pro.arcgis.com/en/pro-app/tool-reference/spatial-statistics/h-whyhexagons.htm based on "Birch, Colin P.D., Oom, Sander P., and Beecham, Jonathan A. Rectangular and hexagonal grids used for observation, experiment, and simulation in ecology. Ecological Modelling, Vol. 206, No. 3–4. (August 2007), pp. 347–359.") including the very important one of being more appropriate for generalization.
Adding an option to "2DGridAccumulator" to generate hexagon grids directly in FME would be very useful
