Most of what you're talking about is non-fiction "answers". Long form writing isn't particularly conducive to reading online (mostly meaning the web/HTML pages), but obviously you could do so via a PDF of a book. However, you're completely missing out on long-form fiction if you don't read "books". I'd recommend you read this recent article about binge reading [1], as it concisely captures what you're likely missing out on: the engrossing nature of a multihour in-depth read.
I now do most of my reading electronically (in my case via the Kindle iOS and Android apps, but I'm about to get a Kindle Oasis, because it's finally good enough), so don't restrict yourself to reading physical books. If you happen to have an Amazon Prime account, you can read plenty of books for free via Kindle. So you can also do this as a "no risk" experiment.
I now do most of my reading electronically (in my case via the Kindle iOS and Android apps, but I'm about to get a Kindle Oasis, because it's finally good enough), so don't restrict yourself to reading physical books. If you happen to have an Amazon Prime account, you can read plenty of books for free via Kindle. So you can also do this as a "no risk" experiment.
[1] https://www.nytimes.com/2019/05/04/opinion/sunday/why-you-sh...