Honestly I think Dia and any other AI first browsers are a bad idea.You lose out on the exploratory nature of the web. How are you going to stumble upon a random nugget during a web search session that you never would have found otherwise. This kind of thing happens to be frequently when I don't go to AI to figure something out. I find a new product or new library for the language I am currently working with that may not solve my current issue but I come back to later to improve something I am working on.

The web as a whole is also built on this discovery and people visiting pages and interacting with other. This gets lost when you get into the flow of just AI'ing everything.