I guess you're right, I should choose my words better. I'll explain it better then. From what I've seen on facebook, to people who I've talked to in person, and on the forum, people do have a problem with this.
Now, I could be way wrong about how many people find an issue with this haha.
But to make x-plane 10 more realistic, a mature cumulonimbus cloud that has an active thunderstorm brewing underneath it, should rise to an altitude of over 15 000ft at least. (And based on the cloud shape in skymaxx, it does look like you are representing a mature cumulonimbus cloud)