Because something is widely adopted it doesn't mean it's good practice.
Some things are adopted because it allows the author to be lazy; or publish existing content quickly.
PDF files...
They have the advantages of: allowing existing documents to be quickly published on the web; preserving the fomat of a document; collating all the pages in one package; and allowing the whole document to be easily printed.
They have big disadvantages for web surfing: just about all of the functionality and advantages of web browsers and surfing the web are bypassed!
Generally, no division of the content with links, no bookmarking of specific sections / pages, and most browser functionality is bypassed.
Downloads may be too slow as well.
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