It comes down to avoidance. Simply answering a question avoids suspicion.
There are 2 areas that might cause an issue with Brainwarp. The idea is quite good. However with the immense FOV (200) it might cause unforeseen problems.
Some have said the peripheral is more sensitive to flickering. Now in normal mode no one has mentioned observing flicker (even though some concerned about 80hz). But you might with BW enabled(but maybe not).
Because each eye doesn't see the same verses tradition vr headset. You "brain" in creating the blanked frame say using left eye to create the right eye might create it's own form of Artifacts. But maybe not.
Now in terms of progress? A simple answer that might appease most?
"The team is still working on BW but atm progress has been slow; due to exploring methods to gain higher stable refresh."
But side stepping the question consistently only serves to spark the imagination as to why it's being avoided.