Everyone thinks they want to read a PDF on something that isn't a desktop or an A4 sheet of paper, and then they try it and realize that there are basically no PDFs that are laid-out in a way that could be feasibly consumed on such a device.

In addition to that, writing heuristics to try and make it possible to unify the experience of reading any arbitrary PDF is such a quagmire/shitshow that basically no one is willing to step up and try to make it possible.

It’s about as pleasant as reading a pdf on a phone. Yes, supports it, but you’re either constantly panning your viewframe or have superhuman vision.

The Kindle is perfectly capable of letting you view PDFs. Many humans are not perfectly capable of reading material laid out for a letter/A4 sized sheet of paper on a six-inch screen. Yes, there are ways around it, but not everyone finds them satisfactory.

You can, but it's a very unpleasant experience on the Kindle's small screen. The DX was much better at this because it could comfortably display a full page of a PDF without needing to scroll