CariadAgain I think you are just describing the decline of the library service
. I remember when you (anyone) could get books bought in on request if they couldn't be borrowed from other libraries, but those days are long gone, which is probably what you are seeing in your local library. Many libraries no longer have librarians these days and rely on volunteer helpers, and the libraries themselves have become more like community centres than places people could go for quiet study. IME university libraries are completely separate from public ones, so being in a university city has no bearing on the stock in a local library - in fact, if students can get a book from the university one they are maybe less likely to request it from the local one.
Interestingly (or not😀) when I did a huge overhaul of the books in my house it was the reference ones I realised weren't needed. They go out of date, and there is very little that can't be looked up online. This seemed counter-intuitive, as reference books had often been bought with a view to keeping them for fast access to information, but the reality is that it is fiction that is more likely to be re-read and the reference books just gather dust. My children are a lot further down this road than me, and although they are both readers they keep very few books - just their favourites that they go back to regularly. They don't bother with reference books at all, and pass on fiction books when they've read them, or just get them on Kindle in the first place.