I sometimes have to write code or ask technical questions from product specifications. If those specifications are too new (for example right now I'm working with openrtb 2.6), chatgpt won't have any information about them. The ability to pull up a pdf file and ask windows about examples of a particular field in a particular 200 page spec document would greatly improve development for me. That's the feature I'm most excited about (though you can actually already do this with Bing, through edge)
That is left as an exercise for Microsoft to figure out. I'm not confident they will fail. Clippy could come out of retirement with a vengeance as the best member of Microsoft teams.