I love keeping books, and I have thousands of them.
However, for research on _obscure_ topics the web is totally amazing.
Material prepared for the web seems to be substandard. I'll give you an example. Microsoft used to publish paper books regarding their tools and libraries. They were reliable and filled with copious amounts of information. They did away with that and now publish information on the web. That material is scant and filled with links to even more incomplete information. Microsoft products can be used now only by observing sample software source files supported with either no comments or useless comments.