The chat window was always a workaround
The chatbot in a side panel was never the destination. It was the easiest thing to ship first.
Every time you copy text out of your doc, paste it into a chat, wait, then paste the answer back, you are doing the AI's translation work by hand. You become the messenger between two apps that cannot see each other.
Cursor-based AI removes that middle step. You highlight the paragraph, you say what you want, and the edit happens right there. No trip to another window. That small difference in friction adds up across a day.