To the OP - I completely understand the frustration, but to play Devil's Advocate for a moment, there may be more than meets the eye.
I've a feeling when the PDF is made from Adobe InDesign, there may be a certain structure that's kept in the PDF that future versions of InDesign will understand and be able to translate the PDF back to InDesign... but PDFs made elsewhere may not have that syntax and as a result wouldn't import properly and would result in a poor conversion. My guess is that they're trying to make the PDF->ID conversion as seamless as possible so items made in the original ID file such as styles, layers, parent pages, threaded text etc are maintained.
Ideally, what I think would be better is a prompt that at least said that the PDF wasn't made in InDesign, but at least attempt a conversion, and what you get, you get... warts and all (like OmniMarkz from Markzware currently). However that is better done as a suggestion to the InDesign developers over at indesign.uservoice.com
That said, competitor software that opens PDFs natively isn't without its own issues. Mike Rankin has a 40 minute Youtube video where he highlights the issues with such a conversion. Similarly, Markzware's OmniMarkz product isn't a turnkey solution but does allow for other conversion avenues, particularly ID to Illustrator - something I'm doing a lot of as the ESKO plugins work in Illustrator only.
With all of that out of the way, don't think I'm cheerleading here... if you've read my blog back in October 2023 you'll see two pieces that were critical of the 2024 release – the first post was a parody piece highlighting fake features that weren't actually implemented (but arguably should be), and the second post was why I made the parody piece (TL:DR - to highlight what could have been).
To their credit, the InDesign team did implement one of these fake features, and not as a major release but as a minor patch (i.e. add Firefly content to InDesign) and actively promoting the upcoming feature of the PDF conversion in the beta.
At the same time though, this is very early days of the PDF->ID conversion, so with further input from the community via the indesign.uservoice.com page, perhaps the team will heed the user feedback.
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