There's still good and plenty fuckery that can happen with citing books, though. Depending on the obscurity of the book, whether or not it's out of print, or just has been outright destroyed, it might be really hard to access a copy, and check the source, especially if someone doesn't have access to the internet archive or library genesis, i.e. digital scans of said book. There are reprints and new editions, sometimes not noted by the author of the citation (the author might have no way of knowing, depends), which can change or remove quoted passages. The internet also contains the ability to mass copy anything you want, and cite that copy, like what the internet archive does with the wayback machine, so if you have a citation of a webpage it's probably a good idea to copy that in time and then spread it around anyways just for the sake of posterity and accessibility, especially if it's obscure or is likely to be changed or removed. Same as you might for a book, except much easier, it's much harder to copy a whole book in context and spread that around compared to a webpage.