Search engine going downhill is mostly a side effect of AI enshitification getting in the way. Even google, which people keep saying is "dying", works as well as before as long as you're not using their default page which is filled with AI garbage and other automated content.

Also, Large AI models from large provider doing a fair bit of actually useful work would have to be confronted with other way to do said work. People burning tokens to edit PDF isn't exactly that efficient compared to opening a god dawn editor.