As someone pretty interested in Egyptology, I've been wondering this for a while, and different documentaries that discuss the library seem to contradict one another on this topic. Some say that if the library was preserved we would be living in a world 1,000 years ahead of where we are now (Technologically), while others say it would have done no more than allow present day historians to know what the extent of scientific knowledge was back then. I know there isn't really a definitive answer to this, but was the destruction of the texts inside really enough to curb the progression of science/ technology?
Maybe someone will come forward with another view, but in past questioners about this topic have usually been referred to this post from /u/XenophonTheAthenian about whether anything was actually lost (very little to nothing) and this discussion highlighted by /u/KiwiHellenist about why we care.
In addition to the other answers linked, I’d also recommend this recent discussion by /u/iphikrates that debunks the idea that scientific/technological progress was even a real focus of the library.