It's really not that much of a stretch.
Printed books have lasted for centuries, they aren't something that is just a passing fad. Your 'papyrus scolls' analogy isn't really accurate as books have existed for a long time: there is a current museum exhibition here in the UK with a book on display from the 8th century [that's over 1200 years old]. In comparison to, say, television - printed books are very, very old. Even today, E-readers/kindles are widespread and yet people still read books. I read often and prefer physical books as opposed to digital versions [and I'm in my 20's with 2 degree's!] so I can imagine in a paltry 300 years, some people still preferring physical books.
From a technical standpoint, it is probably incredibly simple to just replicate a book. And she likely spends days at computer screens/reading PADD's. I can see why people in the 24th century may still prefer physical books.
Yes, I know printed books go back to the time of Gutenberg's Bible and did not require a history lesson
And yes many people TODAY, still prefer printed books, but that's because they are what we grew up with and are familiar with. But Janeway didn't grow up in the 20th century, nor does she live in 2016, so it doesn't make sense that she would have the same sensibilities as people do now. She grew up in the 24th century, when people read from tablet type devices and print books are antique curiosities and expensive collector's items and seen behind glass cases in museums.
Her print books are part of a Trek trope of characters just loving stuff from the 20th century: Tom's 1950s TV and his 1930s style Captain Proton, his 1969 Camaro, Sisko's cooking, Kirk's reading glasses, Riker playing 20th century jazz on his trombone. Even. Zefrem Cochrane's favorite music being late 50s,early 60s rock and roll from a vintage juke box is anachronistic, considering the music was a hundred years old at the time of First Contact. That would be about as likely as someone's favorite music now being popular music from World War I. Possible, but unlikely. And unlikely that so many characters would pick the same century.
I don't include classical music in this, as there's a reason it's called classical, so the classical concerts on Enterprise D don't fall into this trope, nor, I think, does Kim's clarinet playing, as I think his tastes leaned toward the classical style, including the piece he was composing in that one episode.
I do, however, cut Janewau a bit of slack for being a history buff who enjoys historical reenactment. I was surprised that she apparently knows how to write in cursive, as she seemed to be doing in that episode where she was writing her log by hand in the daVinci program. Some schools are phasing out cursive even now, so if the trend continues, few people in the 24th century will possess this skill.
