Not the person you asked, but I’d guess it’s multi-factorial. First that LLM-based summaries ARE generally higher quality than the pre-LLM summary tools output. Second, that LLMs are being given away free at point of prompt and are easily found; while summarizing tools have existed at least since 2000 (MS Word contained one), they were not easily found and usually involved purchasing some larger software collection, or a onerous install process. Third, everyone* hates** reading: if you’ve ever has user-support as part of your job, you’ve probably has at least one user where the message they read to you off of their screen tells them exactly what to do, but they chose to call you before really reading the message.

Also, I’m not sure what “long” is. It can be really hard to keep enough attention on something though 100s of pages, especially when it’s not trying to be engaging and is rather dry.

To OP, I would say that you might want to rethink using an LLM summary for any decision process. The LLM architecture makes “hallucinations” inevitable so eventually you are going to read an LLM summary that says the document includes something that it does NOT.