Having information in your colleagues heads only is exactly how you create organisational friction to begin with (now newcomers are likely required to ask questions to your team directly). Also over time this information gets completely lost (forgotten by people or when they leave the company).
Oh no, asking questions! The horror! If people start communicating, next thing you know they'll be collaborating, and then they might even eventually form a supportive, cohesive team. And we can't have that.
