I've watched developers who clearly know their stuff completely fall apart in interviews (me being one of them). Not because they didn't know the answer they did. They just couldn't get it out of their head and into words under pressure.
Source: [Dev.to](https://dev.to/d_j_2515aadc6ba65a085d7cd/voice-interview-prep-for-developers-why-typing-your-answers-isnt-enough-23c0)