You do realize that Google Play Books always downloads the books, and those instructions essentially tell non-tech-savvy users how to download a book before they want to read it...
...so they don't get caught without an internet connection, want to read the book, say "ooh, pretty cover pictures, here's my book", and then "@#*&^ why can't I read my book which is right here".
As for OverDrive Read, I seriously doubt most people read books in their internet browser. Ridiculous hackery is required to turn it (website) into an ereader, and once a book is downloaded into localstorage for reading online, it is already available offline as well.
Also, don't compare websites to apps.
Aside: The calibre content server is currently undergoing a rewrite. IIRC Kovid mentioned some time ago that whenever he got around to the rewrite, among the features he would add is an in-browser version of the ebook-viewer. Modern web design principles say it would use localstorage to store the ebook, and just like OverDrive read would be available offline as well.
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