I've been saying that.
However ... some of the Bullpups ... especially the older custom made ones ... have buttpads that can be adjusted so you can shoot buttpad rested on the ground. The intermounts could also be made so that the scope could be mounted much lower. So they could be used in HFT and do well with no problems.
( ... and we've got a HFT World Champ saying Bullpups could be used in HFT