During the course of the interview, it was clear Kay was very much talking about computers as consumer devices. He's really fixated on making them far easier to interact with and giving them UIs that do not require users to adopt the computer user mindset to get work done. Getting around that need is part of his attachment to WYSIWYG, ease of use, simplicity of design, and the rest. That quest for ease of use was a theme present in many one-off remarks on unrelated topics and tangents.