I can see that. Though I would submit that is really extends across all genres. The magic emphasized in scifi/fan probably makes in more apparent.
My research tends toward Biblical reckoning of other religions - and the occult and satanic stuff particularly... So you are kinda speaking to a parallel - And it makes it hard for me to be entertained by anything, as pretty much all of it winds up washing through my study filters 
You are the second person to recommend 'Ringworld' by Niven. I have a couple more to clean up in my Kindle after this series (Mistborn by Sanderson), but Ringworld is now very definitely in the rack. Thanks 
I will have to kick the tires on the Japanese stuff - That'sa whole nuther thing, but I will give it a whirl.
I can suggest that you try a Kindle Unlimited account - For 10 bucks a month I can read tons and tons for free. I could never keep up with my voracious appetite without it.
I am kinda in the same boat. I quit reading for pleasure when I put on cheaters.They so offended me that I just stopped.
Research is different. That is done sitting up at a desk where the reading glasses won't get fouled. So internet and white papers remained. But I didn't pick up a book for pleasure in well over a decade.
My fairly recent foray into ebooks changed my life. Adjustable font solved the cheater problem outright, and since then, little more than a year ago, I have read hundreds and hundreds of books. All for nothing but sheer pleasure. It has been such a joy for me. 
Oh yes, it no doubt extended across all genres and all of publishing really, all a part of the Communists' "march through the institutions". I mentioned SF/F specifically because that's all I read when I was younger and so that's where I noticed it happening. I didn't realize it at the time, but it probably is what contributed to my reading less back then, as I found fewer books/authors that I enjoyed reading. In the same time frame, publishers ended the Western genre (largely written by and for men) and the Mystery genre experienced the same shift that happened in SF/F, away from "hard/logical" storytelling and towards "soft/emotional" storytelling. I didn't (and don't) read many Mysteries, but I've read other people commenting on the same shift happening at about the same time. But anyway...
My wife had a Kindle Unlimited account, and made good use of it. I don't read enough to justify having one, as I deliberately limit myself to reading only 30-60 minutes per day. A single book of moderate length (not a doorstopper) can take me 1-2 weeks to finish. I limit myself that way because if I didn't, I wouldn't do anything but read, and I have other things that need doing. And Amazon runs enough Kindle sales that it's relatively easy to pick up something I find interesting at $1.99 or $2.99 on sale.
"Ringworld" was an interesting book, with a twist in the middle that changed the focus of the story. Larry Niven is a good writer, and has published a number of good stories. His collaborations with Jerry Pournelle are also top tier storytelling.
As for the Japanese light novels, they are not for everyone. Most of them are very "light" reading, written specifically for adolescent boys. Some touch on more adult topics or are focused more towards late teen/young adult men. And of course, all of them are written from a Japanese/Eastern mindset and culture, which can sometimes make it difficult for a Westerner to understand, or appreciate the storytelling. All of that can make it hard to figure out what series might appeal to a person. But, when you find a series or author that you like, you can usually figure on there being 10+ volumes to read, with some of the more popular series running for 30, 40, or 50+ volumes (not kidding).
I've worn glasses since I was 9, although I had to switch to bifocals a few years ago, and now I more often find myself peeking over the top or under the bottom edge of my glasses as I read (or just taking them off entirely). But I can appreciate how the adjustable text of e-readers can make it so much easier to read. I'm glad that you were able to rediscover a hobby that you enjoy.
