Software development is a creative engineering process. Successful software projects require teams of highly skilled modern day craftsmen. Each individual has her/his way of getting into that creative state of mind and has their own environment preferences.
Why should a company's choice of tooling stand in the way of these creative minds. One person might really be into NetBeans and another into IntelliJ. Why decide for them?
This is why we think that each developer should choose her/his own toolset/IDE.
An interesting observation however is that most developers end up converging to the same toolset in the end...