Its very simple, for something to be considered a training device or simulator, precise control of all weather features is essential. That includes, visibility / RVR, ceiling, wind direction and speed, QNH and temperature. Without that its useless as a training device for instrument flying. For low visibility training you need to be able to precisely control RVR and ceiling in order to break out of the clouds and have the runway / approach lights in sight at exactly the right moment (or not). I don’t care what it does in the background to achieve this, aerosol density, temperature / dewpoint split, relative humidity, compensation for runway / approach lights intensity, day versus night, etc. I have never used any simulator (approved synthetic training device or not) which does not have that capability. Apparently it is able to do just that in live weather, so it must be able to do it using weather preset as well? Instead of getting visibility info from a METAR it gets it from a slider instead? And instead of creating fog in and around one airport, the fog layer should be worldwide, just as you will have scattered clouds world wide when using that preset, or a 20 kt wind for example.
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