It&#x27;s not that they are unaware. I talked to Jon Callas of SilentCircle at MWC back in 2014 and he was totally aware of the isuue. Back then he argued that the BlackPhone 1 was a first generation product and they would solve the issue later on.
It&#x27;s disappointing that they haven&#x27;t managed to do so by now, but it&#x27;s not completely surprising. The market for baseband chips (and their software) only has a few big players and it takes considerable resources to implement an LTE stack.