One thing is forsure. Sefarim will never be obsolete. There would be a problem of shabbos and yom tov. However there are sefarim that are hard to get and are available on databases. There was a sefer I was once looking for that I went to a several bookstores to look for that wasn’t well known and none of them had it, but I found out that Otzar Hachochma had it.
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