I have, we were 15 at the start of LH and 13 and the void’s death. In your defense we were all experienced with small voids but we had no RL, no voice chat at all. Void is hard if you don’t know what you’re doing, else it’s a breeze.
You’re also severly underestimating how good players are, groups don’t lose half of their players to MBC survival. If you dodge slow and pet stasis, there’s nothing to worry about - and if the group starts with 80 players, you’re probably using pub halls which is filled with priests.
How many voids have you completed so far?