To make it easier to understand, we took a screenshot of the document by making it smaller. However, I always feel that the document is blurry (the first screenshot I uploaded to the post shows that the document was taken in a big way, but it was blurry). This is because documents are very clearly represented in other document apps.
As you said, the larger the document, the clearer it becomes. However, if you are zooming in on a document and you do not try to swipe your finger vertically, you will always use it to fit the frame because of the inconvenience of the document moving from side to side when you flip the page. This is because even if you swipe your finger roughly, you can move the page as you intended.
The screen shot may not seem to make a big difference, but reading the document all day makes my eyes very tired.
The same symptom found while searching for forums. It’s all from the Mac, but my iPad Pro has exactly the same symptoms. If there is no way I can do it, I sincerely hope you can improve it through the update!