I know very little about these beyond noticing that modern cheap paperbacks need to be held open with two hands. I work out that the paper used by some publishers is cheap and over stiffened. Certainly the spine glue is now so effecive that there is no flex to the spine. At first cheap paperbacks had a poor reputation because the pages fell out ~ now the reputation is that they are so securely glued that want to spring shut all the time. There is no great public outcry over this ~ probably because books are not widely read anymore. I am tempted to add to any definition of a well bound book as being one that lies open flat.
This need for an open book must be quite common. With approaching old-age my hands get tired when holding a book when reading at a desk, and my eyes appreciate a book that is propped-up against another pile of other books. So I have bought a simple book stand ~ chosen from a well known WWW store where there were about a hundred or more different stands to chose from. For interest I have downloaded some pictures ~ and trust that those involved will not mind my reproducing them. There are a great many more 'up in the cloud'