Very interesting. I’m not sure whether that fallacy applies. Hard to find authoritative statements on it. There is a thread on aviationexchange where some say

Very interesting. I’m not sure whether that fallacy applies. Hard to find authoritative statements on it. There is a thread on aviationexchange where some say that an underslung helicopter is actually more stable than a conventional one, but I haven’t been able to verify this. With a multicopter, the situation might be different still.