I assume that you are talking about modern "theoretical CS", because among the "theoretical CS" papers from the fifties, sixties, seventies, and even some that are more recent I have found a lot that remain very valuable and I have seen a lot of modern programmers who either make avoidable mistakes or they implement very suboptimal solutions, just because they are no longer aware of ancient research results that were well known in the past.

I especially hate those who attempt to design new programming languages today, but then demonstrate a complete lack of awareness about the history of programming languages, by introducing a lot of design errors in their languages, which had been discussed decades ago and for which good solutions had been found at that time, but those solutions were implemented in languages that never reached the popularity of C and its descendants, so only few know about them today.