I think you both might have missed the point. Biometric devices require FDA certification, which takes a long time, and of course the devices have to be accurate and reliable to be approved. A few new hires doesn't make Apple expert in this area, it just barely gets their foot into the door.
I'm well aware of that, I'm also aware of the fact that Apple executives have been meeting with FDA. The reasoning behind those meetings is unknown, but it is fact according to sources. I am very well aware the sensors must be highly accurate, and that has been a worry of mine since I saw the first rumors.