Yeah like when you buy a new car and 3 of the 4 doors open and that's kinda all you should ask for.
To be fair, I myself wouldn't be too bothered because of my use case. All my dynavaps have their airport adjusted from the inside with the smaller o ring so that the airport is 90ish% blocked, and when I take a hit I go between that and fully closed. So even the vong I'd always have in the same position. But still, pretty annoying for people who were hoping to get the functionality that was advertised to them when purchasing.