I would imagine mostly data cleaning, but for some complex cases, for example this:
If the person wants to have a quick solution for their problem then QUERY can be used, before we can think of a solution in Glide editor. That’s the first cause for this. Secondly, I believe this would help people in their normal work as well.
Of course I want to do all things in the Glide editor myself to eliminate the lagging, and Glide editor is getting stronger by time.