I'm looking at some datasheets for interior plaster by Saint-Gobin (which unfortunately are not available in English as far as I can tell) and I'm miffed why some interior (white) cement-based plasters are advised to be sanded as the final smoothing step and for others the advice is to wet float them. As far as I can tell the maximum aggregate (sand) size is the determining factor, those that they advise to float have max particle size of 1mm, the other ones are in the hundreds of micrometers range. Is this the determining factor, or are there other considerations?
To add some details, these are all skim coats. The one with 1mm max particles allows for maximum 5mm layer, while the other ones (hundreds of micrometers particles) only 2mm layers.