I’d be careful comparing a photo or video because what you see with your eyes is often very different to a photo. There have been plenty of posts where people want MSFS to look like a scenic photographers photo rather than what we see in real life with our eyes.
I’m not saying you’re wrong though, the top cloud layer can look brilliantly white as long as it isn’t a storm cloud and it is dense enough.
I most certainly do not want thunderstorm clouds to be white though. They mostly match what I see outside my window and that is good for me.
I do wonder how much monitors factor into this. The color accuracy and dynamic range of monitors varies a lot and there is nothing Asobo can do about that. To really do lighting accurately you would need a HDR monitor. Amazingly enough I have one but never enabled it, I never had an app that used it before so I’d never even thought about it. Time to experiment!