My guess is that this is about dedicated hardware like trim wheels, radio panels, etc… They do not always seem to play nice with MSFS. My VKB Kosmosima works perfectly well with MSFS btw. 
My guess is that this is about dedicated hardware like trim wheels, radio panels, etc… They do not always seem to play nice with MSFS. My VKB Kosmosima works perfectly well with MSFS btw.