I think Apple is a bigger driver of the investment than Google or FB. When the first IPOD came out few investors saw that Jobs was executing on a vision that would create a trillion dollar company. Those same type of investors are afraid of missing the next Jobs. A CEO is better off taking actions which will cause investors to think she may be the next Jobs.

And they are right to be afraid, engineering advances can be unpredictable. What if a AI developer at TSLA discovers a new approach to reinforcement learning tomorrow? Or what if Holmes had found the Einstein of blood science?